Yahoo! acquired delicious over two years ago. The obvious integration point for delicious is Yahoo! Search but after all this time they still haven’t integrated the two products.
Yesterday I noticed that Google has begun to integrate my Google Bookmarks into my search results. I used Google Bookmarks for a few months and it pretty much sucked compared to delicious except that Google Bookmarks search actually worked. Delicious’ search interface searches across tags and descriptions, it doesn’t actually search the content of the pages you’ve bookmarked. With Google Bookmarks each page you bookmark is indexed so you can search across the tags, description and the full text of the page.
Now that Google Bookmarks is actually integrated into Google’s normal search results as well I need to revisit replacing delicious again.