Get chomp sms or handcent sms to use as your text messaging application.
Get My Tracks to use as a bike GPS mapping recorder.
Get i music to download songs for nowt.
Get Aldiko to use as an e-reader electric book thingy.
Get Advanced Task Killer to help shut down programs you don't want running all the time.
Get Guitar : Solo Lite to play with.
Get WiFinder to help with wifi finding.
Get a Google Mail account, and set it up BEFORE YOU SET UP THE PHONE.
Then just type in your details when asked during setup.
Get used to people saying " Is that an iPhone?" then explaining that , no it's not, but it does similar stuff.
Put widgets to turn on your wifi and mobile internet somewhere obvious, and only turn them on when you want them on.
Enjoy.