5. AppBrain Market Sync
You iPhone users won’t believe this, but there’s no official way to install Android apps from a PC. Seriously. You’d think Google of all companies would’ve sorted that out, but no. Which is where the unofficial AppBrain app comes in, letting users queue up Market downloads via PC and have them sent to your mobile. You’re also able to generate an embeddable code that displays your currently installed apps on a website.
UPDATE: Obviously Google now supports web-based Android Market app installations and purchases, which makes the above a little less exciting than it once was. But well done for leading the curve for so long, AppBrain.