Bitpixels.com is awesome!
Here are some other ones you might consider for other purposes involving image resizing with one line of code:
http://www.sencha.com/learn/how-to-use-src-sencha-io
http://cloudinary.com/
just noticed Cloudinary can generate thumbnails from YouTube videos, described here:
http://cloudinary.com/blog/generating_video_thumbnails_from_youtube_and_other_video_sites
Very cool
Here are some other ones you might consider for other purposes involving image resizing with one line of code:
http://www.sencha.com/learn/how-to-use-src-sencha-io
http://cloudinary.com/
At some point we'll add a few configurable options. FOr now - this may make a good idea for a simple plugin for Market.
http://cloudinary.com/blog/generating_video_thumbnails_from_youtube_and_other_video_sites
Very cool