On iPhones with firmware 2.0 or greater, it's easy to take screen captures.

Just go to the screen you want to take an image of. Press and hold the "Home" button and press the "Power" button briefly and a picture will be stored in your camera roll as a .png file. That's it.

Synchronize the built-in calendar and contacts on your iPhone with your Google account.

- Get Google Calendar events on your device
- View multiple Calendars in different colors
- Synchronize your Contacts with Google
- Have changes pushed directly to your phone

Remote Mac monitoring
Remotely monitor CPU, memory, disks, temperatures, fans, uptime and load averages of any Mac or Mac server... from your iPhone.

iPhone stats
See your iPhone's stats for memory, disk space, WiFi and Cell IP addresses, uptime & load averages,