One of the iPhone dissapointments, besides the lack of Flash support, is the fact you can’t control your mac with it. I had hoped for the ability to send commands to AppleTV or other Macintoshes via bluetooth. Hopefully that ability will come in the future. For now there is the telekinesis iPhone Remote. The project appears to install a web server that has the ability to interact with the host system in such ways not possible with a traditional Web server.
Features:

• Stream music and videos from your computer ( 0.9.8 ) learn how
• Screen capture with mouse click and basic typing support
• Simple iTunes Remote control
• Browse your files
• Run applescript remotely
• iSight image capture
• Easily create and add more apps

Be sure to check out the security warnings, this might not be for everyone.