I just wrote an article recently on the Google Sitemaps Webmaster Tools and Yahoo! Site Explorer, and today I discovered that Google's webmaster tool has added a link feature!
It can be used to check how many external and internal links a website has. It seems like Yahoo needs to move faster if it wants to catch up with Google!
Also, there is a new tool on the Google Webmaster Tools homepage:
"Tools
Download all site data Report spam in the index Submit a reconsideration request
Pretty cool, right? This definitely makes things more convenient!"