Hot off the press! Last night VMware posted critical updates to vSphere 4.0. You can find the patches here. If you want to read the release notes, they are available here. Patches apply to both ESX and ESXi hosts.
This does not appear to be Update 2, which was rumored to be released late February or early March. So it appears we still have some waiting to do for Update 2. That’s too bad as I have numerous SRs open with VMware for some pretty obvious bugs that slipped through QA.