Mmm, I've got a few that are really cool Tonido that lets me connect to my server from anywhere well at least I could if NFS worked on my server-roll on 26/04/2012 12.04 LTS will be realesed, XBMC remote control-does what it says on the tin, Yell should I need something whilst I'm out and about and Barclays Bank to see if I've enough money buy it

, AirDroid allows transfers of files from PC to my phone via WiFi, the list seems endless.
Good call on the flash light app Ian.
One thing I am looking forward is the Ubuntu app for 'Droid, may be this could be a smoke screen for a full blown Ubuntu powered phone/tablet, I am convinced the people over at Ubuntu know a little more about Linux that Google.