Online Status Indicator is a service that lets you put a small image on a web page to show if you are online on AOL Instant Messenger, ICQ, IRC, Jabber, MSN Messenger, Skype, and Yahoo Messenger. Use the default icons or create your own status icons. This service is completely free, but donations are gladly accepted
Don't you hate being blocked by other instant message buddies? Not sure if someone's blocked you? Blockstatus.com will allow you to see if someone on AIM, Yahoo, MSN, or ICQ is online whether they've blocked you or not.