If you're a big YouTube user than either Lazy Worm (review coming up) or SuperTube (see video review) are your best choices. SuperTube just hit v1.5 today and brings a bunch of new features (as well as updates from previous versions). The app has the ability to stream and/or download any YouTube video for later viewing and allows 720P HQ playback, which as you can see from the screenshots above, is really high resolution. Surprisingly, there is no stutter during playback due to the new optimized video player.
Sure, there's a few spelling errors e.g. "buffing" instead of "buffering" and v1.5 actually reads v1.4 in the About Page, but in terms of style, function and ability, the app is up there with the top (it currently has 4.5 stars in the Marketplace). The app fetches for $1.29 (trial is available) and there is a free, ad version as well.
We have the entire changelog after the break.