Firefox with Greasemonkey: Force YouTube to always bring you to the high-quality version of a web video with YouTube HQ, a simple but great user script. There are actually two modes to YouTube HQ, one that always loads the standard/lower-quality video for low-bandwidth connections when you jump to an HD/high-quality page, and the much more useful always-high-quality standard version. Unless you break open the code and tinker with it, it's a pretty quiet app that does one thing well—watch your YouTube URLs and fix them to load the higher-quality stuff. But you can also tweak YouTube HQ to try and resize the player for better viewing of 720p content—which generally means even better video views.YouTubeHQ is a free download, works wherever Greasemonkey scripts do. For those just looking to download high-quality vids, might we recommend the previously mentioned H.264 user script?