1) Firewire is dead.
2)older charging cables won't work with newer iWhatever devices. You can probably just get a new USB cable for your HU and it should work.
3) Jail Break.
4) settings > Safari> enable autofill
5) doubt it
6) free stuff I use: Weatherbug, Shazam, Waze, Facebook, Pandora, AIM, Flixster, Chipotle, eBay, Urban Spoon, Cheap Gas!, Speed Test, myWireless, Papertoss, Pocket tanks, space deadbeef, fallingballs, iheartradio, pic2shop, Photobucket, Photo shop mobile. That enough? JB and there's more.
JB) You might have some trouble with Jail breaking your iphone. Apple changed the boot ROM not too long ago, and the new 3.1.3 OS was designed to kill jail breaks.