Update: Yahoo! has talked to me about the issue and showed me how to deal with Yahoo! IDs. The next version of DeliciousSafari will have support for Yahoo! IDs. Stay tuned.
Good news
You can now access delicious.com with a Yahoo! ID.
Bad news
Yahoo! IDs don’t work with the delicious.com API. That means DeliciousSafari, Bookmarks Pro, and any other application or website built using the delicious.com API will not work if you try to login with your Yahoo! ID. If you have an old school delicious.com account then you’re fine. This only affects new users who have to sign up using a Yahoo! ID.
I’ve contacted Yahoo! about the problem. Hopefully it will be fixed ASAP.
Bookmarks Pro 2.0 is now
It’s been a long time coming, but I finally released 

