Updates for 12/11/07

Mostly bug fixes today.

• Fixed: existing playlist presets in the player and added a few new ones
• Fixed: The mystery of being logged in as a ghost user
• Improved: The Twitter service can now take any username (more on that later today)
• Improved: The library browser in labs now supports tag browsing and browsing the library of all your amie street friends
• Fixed: lightboxes are back to fixed position. No more losing the lightbox when you scroll on the page.