We now have a few more options for Leopard, and Snow Leopard for YouTube.
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IMPORTANT: Leopard users will need
QuickTime 7.7 for optimal performance.
Download: http://appldnld.apple.com/QuickTime/041-0741.20110803.fEi4R/QuickTime770Leopard.dmg
Major update to TenFiveTube!
New features in v5 include:
Adjustable user agents : iPhone / iPad / Android / Custom (iPhone is default)
Bookmark ability
Remembers the last video you watched upon launch
Supports tabbed windows (Command + T)
Ability to show/hide tool bar
GreaseMonkey-like scripting (install viewtube and viewtube+ to enable video downloading)
Get the scripts here:
http://sebaro.pro/viewtube/
You can enable / disable your scripts via the script icon on the menu bar
It's also a web browser. Enable the toolbar (menu -> view -> show toolbar)
Then menu -> preferences -> advanced -> allow browsing to any URL (otherwise just browses YT by default)
Type in an address and surf

....and lots of other little options you can play around with
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To adjust quality click on the playing video and select the gear icon
To enable full window-mode click on the playing video and click the [ ] box in lower right corner
To enable full screen, menu -> window -> toggle full screen mode
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Download HERE (roughly 62mb)
New versions for Snow Leopard linked
here
Cheers.