Auto-linking, preferences and more page sizes now in Google Docs

Auto-linking: Now when you type something that documents recognizes as a link, it will become a link automatically. If you don’t want your text to be a link, you can undo the auto-linking by pressing Ctrl Z (Cmd Z on a Mac).

Preferences: If you don’t want automatic link detection, you can disable it completely by opening the ‘Preferences’ dialog from the ‘Tools’ menu. You can also permanently disable curly quotes (smart-quotes) in this dialog.

Page sizes: More page sizes have been added to documents. Find the new options in ‘File’, then ‘Page Setup’ when editing a document.
For more information:
http://googledocs.blogspot.com/2010/08/auto-linking-preferences-and-page-sizes.html