Some Apps from an iPhone fanatic

(I have 285 apps!)
Autostitch - great panos
DLSR remote - control your laptop tethered DSLR using your iphone over wifi, with live view on your phone!!
Polarize (free) - cool polaroid pic creator with comments added to the white strip
ProCamera - camera app with zooming, anti-shake etc
Legophoto (free) creates a mosaic with lego bricks from a photo, touch to randomise colours
Dropbox (for mac, PC, linux and iphone) online storage, sync between computers, 2.5Gb free plus up to an extra 3Gb (in 500Mb blocks) when you refer others (my referral link is
here)
If you put images in the dropbox image folder then you can view them in a slideshow on the iPhone.
Other cool apps:
pocket universe and skywalk, both planetarium apps that use your gps position and compass (3GS). You hold them up to the sky and they display all the stars/objects in the night sky.
Evernote - write notes, clip webpages, take photos and sync them across your computers, phones and web. All for free.
rightmove - very useful if your looking for a new house. If your out and about you can use your gps position to find information on properties for sale in the area, check out google maps etc.