According to Microsoft's website, Windows media player supports .Avi:
Audio Visual Interleave (.avi)
Versions of Windows Media Player that support this file type:
• Windows Media Player 7
• Windows Media Player for Windows XP
• Windows Media Player 9 Series
• Windows Media Player 10
• Windows Media Player 11
Audio Video Interleave (AVI) is a special case of Resource Interchange File Format (RIFF). AVI is defined by Microsoft. The .avi file format is the most common format for audio and video data on a computer.
YouTube takes almost any kind of video for upload. .Avi will work fine.
I'm so close to buying a Nikon D90 to shoot photos and video. Anyone want to buy a used Canon 400D w/ Tamron 28-75 F2.8 Lens? I can throw in a 4 gig CF card too. (The Nikon takes SDHC cards).
I'm thinking I will have it by Christmas!
I'm looking forward to watching some new vids from Omaha from the photogs on this forum. Can't wait to see what we all come up with.