Last week, I discovered that the standard ‘save to delicious’ bookmarklet pretty much sucks on the iPhone. It tries to open a new window. It doesn’t use the mobile version of delicious. When I got back, I realized that nothing I’d been saving actually got saved.
It doesn't open a new window, and it does preload the URL and title. Now if delicious will just get tag autocompletion working, bookmarking on the iPhone will be just about perfect.