Service Pack 1 is available via Up2date.
It includes all former fixes and updates the core files to the nightly from 24th.
Please restart your computer before doing this Update.
Please don't run anything else then the updater!
Otherwise it could happen that some files can not be overwritten.
The Updates weights ~14MB, so it can be ready in 1- 5 Minutes (depending on your network)
After doing the update, just reboot the system to get the new Kernel running : )
http://www.youtube.com/watch?v=085wL6Rj8GYThe whole update took in Virtualbox 2,5 minutes
During small updates, like in the past few days, you could work or watch even movies, but during a ServicePack(a system update) you shouldn't do much!