I do not a very good first impression of Delicious:
Sorry, there is a temporary problem. Adding a new bookmark failed.
Please use your browser's Back button and try again. If this problem persists please contact support.
Hmm... isn't adding a bookmark the main feature of the service? Delicious has now broken over a dozen times in the first 10 minutes of use.
I would think adding bookmarks would be rock solid.
Ironically, many of the support pages fail to load properly because Delicious has mixed secure content with non-secure content causing warning messages to pop-up on a regular basis.