I used to have an app' for my iPhone which allowed the iPhone to be used as a wireless webcam.

You'd start the app' running and it'd start transmitting the feed from the camera either to a wifi network or even directly to the internet.

You could then get on a PC, type in the IP address of the phone (provided by the app) and view the camera footage on a web browser OR you could configure programs like Skype to use the feed from the phone as a regular webcam.

Anybody know if there's a similar app available on the Android Market?

I assume there must be if it's available for the iPhone but I've had no luck finding one on the Android Market.

IP Webcam
Mobile Webcam

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airdroid can do that

plus you can send sms, copy files, take screen shots etc.