Skype just released a new beta of 4.0.called Skype 4.0.0.155 Beta 1 for Windows. Just remember there are some caveats to using Skype 4.0 beta. Read here for more.

Here's what's new / fixes:

30.07.2008 Skype 4.0.0.155 Beta 1 for Windows

• change: Firefox Skype plugin updated to version 2.2.0.94
• bugfix: Video mood and instant messages did not work when user had Flash Player 10 installed
• Localizations updated

Also, here's what was fixed in the prior version of the Skype beta:

09.07.2008 Skype 4.0.0.150 Beta for Windows

• bugfix: Renaming a contact did not work correctly

• bugfix: New audio device notification was sometimes wrongly presented for SoundMax devices

• bugfix: Incoming chat notification was played when it should not have been
• bugfix: Changing ringing device also changed speakers
• bugfix: No sound was played when sending a chat message
• bugfix: It was not possible to remove echo123 from the contact list
• bugfix: Skype sometimes crashed when recording voicemail
• bugfix: Getting Started Wizard sometimes misbehaved after making a test call

Go grab your new copy here.