Here are my 5 most used apps for iPhone:
- Reeder RSS reader
- Instapaper for saving articles
- BeejiveIM Instant messanger
- Jump RDC/VNC viewer
- Dropbox for iOS lets me easily load files onto my phone. If I have a PDF or ebook that I want on my iPhone/iPad I can throw it into Dropbox on my laptop, open it on my phone, and then send it to iBooks to read it. This is less of an issue with wireless syncing in iOS 5 but old habits die hard and I still do it this way.