I still use my N810 on a regular basis. I don't have a smart phone or an iDevice so my N810 comes in handy often.

I use it to connect to wireless networks and although I haven't used it much, I can use Optimum wifi to connect when I'm out and about. I sometimes use it to listen to internet radio or as an mp3 player. It gets a lot of use as an emulator, letting me play Gameboy Advance games and SNES games (only with legal ROMs of course!).

At first I used the GPS, but now I never use it. I installed the community SSU updates and just downloaded the Klingon theme.