There is a current issue with the JAVA Applets provided with IBM Lotus Domino (up to 7.0.1). These applets are digitally signed with a certificate which expired on 18 May 2006. In theory this should be no issue as the certificate was valid at the time being used to sign the code. The only impact should be that the certificate could not be used any longer for signing.
In fact, several JRE's, including Sun JAVA 1.5.0 prompt the user with a certificate error prompt. IBM reacted by providing a fixpack that includes applets signed with a certificate valid till 2009. You can request this fixpack by opening a PMR with IBM Lotus Support. http://www.ibm.com/support/docview.wss?rs=463&uid=swg21238081

Skype started a new service offering the online status of a user in his skype button.
You can create your own HTML code and paste that on your site http://www.skype.com/share/buttons/wizard.html
Previously, you had to use tools like http://www.onlinestatus.org/usage.php to show the current status of your instant messaging client.
Blogsphere will use this feature in version 2.5.4