Tim Sneath just blogged about an update to Silverlight 1.0 that took place over the weekend, bringing the latest version number up to 1.0.30401.0. The update includes several fixes, including an audio bug fix for nForce 4 motherboards, an update to support custom parameters in ASX playlists, fixes to font support on Mac OS X Leopard and improved multi-language support during installation and update.
You don't have to run out and download this latest version - it will be pushed out via the auto-updating technology built into Silverlight - but if you just can't wait you can get the newest version from here.
And if you need to know what version you're running now, just right-click on any Silverlight content and choose the "Silverlight Configuration" menu option to see your current version number.
Tim also points us to a link for Silverlight release notes: http://download.microsoft.com/download/f/d/8/fd8f5947-78ff-40a5-9a34-5e35243c12e4/Silverlight%201%200%20%20Release%20Notes.htm.
Might want to bookmark that one.