It’s not often you get something for free, with no catch, and that it is useful too.
iSkysoft are offering their iPhone Video Converter for OS X (Intel and PowerPC), as well as for Windows completely free for 12 days.
The software allows you to convert videos, movies and TV shows for your iPhone 3G, iPhone 3GS or iPhone 4. It supports video formats such as WMV, AVI, MKV and FLV. And also allows merging of multiple files into one continuous video.
I’ve given it a quick try out and it seems to do what it says on the box!
Download link : [iskysoft.com]
Do let us know how it works out for you in the comments.