How to convert a .mov into a .gif (or a .apng)

From iMovie, go to Share-> Export Using QuickTime. Set the Export: menu is set to Movie to MPEG-4. Click the Options... button next to that menu.

Set the File Format to MP4
Set the Video Format to H.264
Set the Data Rate to something like 2048
Set the Image Size to 1080
Click OK
Click Save

That should give you a much better-quality video.

Hope this helps!

Did you tried Oplayer ?

Didn't tried it with wmv but works perfectly for me on my iPad 1, with mkv and other formats, even with subtitles. I would love to try it on iPad 2 to see if the new CPU handles 720p videos :)

VLC for iOS was promising before it was removed... sigh. :/

Update 2018: VLC for Mobile is available in Apple Store.