WillCall is now available for download, with a few acts already lined up. The coolest part of WillCall — besides enabling poor planners and procrastinators of the world — is its attempt to capture the inherently social nature of concert-going within the app.

IOS development is not for the faint of heart, and a new blog post by developer Kent Nguyen does a good job of pointing out exactly why. Nguyen targets those who would be footing the bill for app development, in the hopes of lessening sticker shock.

One of the jailbreak features I really wish would come to the platform legitimately is the ability to use launchers to quickly start an app without digging through multiple home screens. Luckily, you can mimic the behavior of a quick launcher with iOS 5′s Notification Centre.

A sharp uptick in the sales of Apple’s iPhone 4S along with the status of “top app of 2011″ has turned this to be a year to remember for San Francisco-based startup, Instagram. The company saw a spike in new users and photo-sharing activity.

Which apps were the best rated and most buzzed about in 2011? That’s a question that app rating analytics firm Mobilewalla tackled, coming up with a list of the top five paid and free apps on four of the biggest mobile platforms.

On Tuesday Kayak plans to launch a new app for iOS. It’s throwing out its old Kayak HD app and making a universal app for iOS. We talk to its head of mobile about the lessons learned since the launch on the original iPad.

For Flipboard, making the move to the smaller screen of the iPhone seems to have been a risk well worth taking; the personalized news delivery service has already added 1 million new users since the iPhone app launched. It’s a good lesson for iOS periodical publishers.

The Mac App Store is not quite a year old, and it just passed the 100 million download mark, according to Apple. Originally launched in January, the Mac App Store is now the “largest and fastest growing PC software store in the world,” Apple says.

Previous generations of home surveillance systems required setup via a computer (usually a PC) and had a high cost of entry, but a new crop of low-cost Internet-enabled cameras promise “post-PC” easy setup as well as iOS integration. I’ve tested two new players in this area.

Google is getting into the personalized news delivery app game with Google Currents, a new product available Thursday for Android and iOS devices. Currents is in the same wheelhouse as Flipboard, which launched its impressive iPhone app earlier this week, and an early look reveals promise.