Aiming to become one of the giants of online advertising, ad retargeting startup AdRoll has hired Googler Suresh Khanna as its vice president of sales. In nearly six years at Google, Khanna held a number of roles. Most recently, he was director of new advertiser sales, where he says he led the North American team for acquiring mid-market and larger advertisers. Until now, Khanna says AdRoll hasn't had anyone focused on building out the sales team, so one of his big goals is to "attract rock stars." He also says that he wants to help AdRoll build relationships with larger advertisers and ad agencies.

Tabber is an upcoming Kickstarter project that essentially adds an LED light show to your guitar and, more importantly, allows you to learn to play chords and solos by following the lights on the fretboard. The idea is definitely not new. The Fretlight guitar beat these guys to the punch and I wonder what patent issues they will have to deal with. However, as an idea, it's pretty ingenious. The Tabber is a "sleeve" that fits over the neck of your guitar and it should work, as the folks at Tabber reiterate, on any git-fiddle in your possession.

Referral traffic is spilling out of both Pinterest and Facebook's Open Graph frictionless sharing. With Sociable Lab's licensable EverShare you can snatch their functionality without any serious development work and soak up some page views. EverShare lets you host your own Pinterest-style product or content boards to give your users their social curation fix. It also instantly roots your site into Facebook's confusing APIs so purchases, comments, reviews, and pins are automatically blasted at friends of your visitors. Great websites steal, they don't borrow.

Here's a fun fact: Batteries and cars require maintenance. The Tesla Roadster runs on batteries that also require maintenance. Out of the 2,200 Roadster owners, apparently at least five didn't read the manual on their new toy and let the car sit off the charger for several months -- or so says one regional service manager. This is a no-no according to Tesla. The result? The battery packs completely died and needed to be replaced at the owner's expense. This is not unique to the $100k Tesla Roadster. Batteries stop working without a charge. It just so happens that the battery pack in question isn't a $100 laptop battery. The latest owner with a bricked Tesla is reportedly going to have to pay $40,000 to replace the battery pack in his Roadster.

It's safe to say we've all been in a situation where a few extra pairs of eyes could come in handy, and the folks at Google know just how that feels. In an effort to give people that backup when they need it, they've just pushed out a useful new update to the Google Docs Android app.

Firespotter Labs, makers of the food photo-sharing app Nosh (and more recently, the hilarious spoof app Jotly), is launching its latest creation today called NoshList, a new waitlisting application for restaurants. The app, designed for the iPad, ties into to the company's consumer-facing Nosh mobile app, which allows users to rate and review restaurants and dishes from their mobile phones.

The WinZip iOS app, which lets you crack open .zip files from your iDevice, has only spent a short time on the App Store (and by short, I mean, like, a week). But there's already plenty to brag about. The app saw over 30,000 downloads on Day One, and nearly 150,000 on Day Two. As of last night, WinZip has blown by the 500,000 download hurdle with approximately 512,000 installs.

Upstart photo-sharing service 500px is bringing some significant changes to the site that should be going live right now (although they're being hammered, so be patient). The site was already one of the frontrunners as far as design and user uptake, and these new features should help that right along. There's a new curated and social photo stream called "Flow" and a new layout for photo sets that can, like the excellent The Big Picture (or In Focus, of course), be used to tell a story. And perhaps most significantly, they've added a full-on market, allowing people to buy and sell photos digitally or in print.

Everyone's favorite way to share thousands of pages of sensitive information (and dump PHP code that you might use later) has upgraded to what it's calling version 3.1. This new version, in addition to some cosmetic changes, includes one major upgrade: private pastes. The system currently supports public and "unlisted" pastes - two types excellent for anonymous sharing - but the private pastes require users to create an account with the service. Private pastes are truly private while unlisted pastes simply don't show up in search results or on Pastebin's popular paste list.

After reports earlier this month that LinkedIn was buying contact management service Rapportive, the startup just published a blog post confirming that yes, it has been acquired. For those of you who don't use it, Rapportive is a Gmail plugin that shows you the latest social network updates from whoever you're corresponding with. (I've gotten so used to seeing the Rapportive window next to my emails that I sometimes forget that it's not a default part of Gmail.) And if you're a Rapportive user who's worried that the deal will follow the pattern of so many other startup acquisitions, it sounds like LinkedIn won't be shutting Rapportive down.