ooo sign me up!
im on a nexus one and lovin' it (using since ~13th Jan thanks to google not shipping UK orders made before 10pm gmt on the 5th jan properly

)
My fav apps are:
-shopsavvy (scan barcode and it finds product's cheapest price online and in any stores near your gps location too - amazing app but doesnt work on things like food, works great on dvds and games though)
-gameboid (game boy advanced emulator - works really nicely and have some gameboy game roms on my sd card)
-google goggles (take a photo of something, google tries to figure out what it is - works best on scanning business cards in - reads the data into contact savable information).
-shazam (listens to part of a music track and tells you what the song is, then provides youtube and amazon links to the song)
-carr matey (free pirate themed car locator - brilliant)
-zombie, run! (gps based maps game where you set a point to get to and it spawns zombies on your route - you have to make it to your destination without being killed)
-flight director (good little flight control tower game)
-layar (using camera, compass and gps shows you where certain shops/services are near you - good for finding pubs/food places on the go as you can see distance and direction of the place through the screen - give it a go)
-my tracks (tracks routes you take with gps and tells you the distance, average speed etc - i use it when walking my dogs so i know how much exercise i get).
-twitdroid (decent twitter app)
-advanced task manager (good for quickly ending all applications running other than those you exclude)
-movies (gives info on movies out at the cinema - can see reviews, trailers and find local cinemas showing it (giving times for showing as well) - must have for any movie lover).
-weather widgets (very good for non sense ui phones - flip clock and animated weather forecast)
the only ones i had to pay for above are gameboid, flight director, weather widgets and twitdroid - most have a free option with less features but to be honest they are so cheap i bought them. All the apps also work great in the UK (and so i assume work internationally as none are uk specific). Yeah i have a lot of favourite apps, but i have 3x that many installed atm
i also have the hacked google maps (not requiring root - my phone's unrooted) which allows you to run google turn-by-turn navigation outside the US - works very well here in the UK, just gotta tune the voice synthesis and it's perfect

there's a good little guide on how to get it working
http://jkkmobile.blogspot.com/2009/1...n-by-turn.html and i use the nav launcher app to launch the hacked navigation (much easier than doing it manually).