I use regular bookmarks (via the browser) for stuff I use daily/weekly. I use del.icio.us for things I want to save and possibly pick up weeks or months from now… mostly design or development related tips/tricks/etc.

I only bookmark things in Firefox that I find and want to go back and read. For those lasting bookmarks I use del.icio.us with easy posting help from Pukka.

I am all Google – my Firefox bookmarks (and history) are being synchronized between my computers by Google Browser Sync Firefox extension, and I also use Google Bookmarks service with unofficial GMarks Firefox extension which can display all my Google Bookmarks in the sidebar.