I was recently recommended Wikitude by a friend, so I downloaded it off the Android market place, and fired it up. It's a little slow to start, but it's something really special once it does.

It uses a combination of the inbuilt compass and GPS receiver to locate your position and facing, then it searches its content database for points of interest around you.

It's pretty cool seeing the technology convergence on a Google map type interface, but once you fire up the 'camera view' then it really comes alive. It overlays the same points of interest onto your camera viewer, giving you information about each as a pop up when clicked on.

Developers' site is here: http://www.mobilizy.com/en/wikitude-ein-reisefuhrer

It's a really impressive integration of technology into real life, which actually has a valid use. On the down side it takes a few seconds to load, and if your GPS setting is off then it's not that accurate, but that's not really a Wikitude issue.

FaceBook Sync for Android is a handy application that scans your facebook friends list, and matches any of their profiles with your contacts list. It will then download their profile picture and attach it to their contact. It is an automatic match using the contact name, as most other data from facebook cannot be queried against, so the names need to be match able.

This is the developer's site:

http://fbsync.plan99.net/

And this is the market barcode:

It relies on you having a well put together contacts list, and it will download duplicates if you have them in your contacts. A top app though!