Ubuntu 10.04.1 has been released, WebUpd8 announced yesterday. Like usually, this version puts together all the updates that Ubuntu 10.04 had until now. So, if you used the update manager regularly, you already have it. It has been released just for those two want to make a fresh install of Ubuntu 10.04 (because this version has all the updates until now and they don't have to wait to download and install them).
This is what is called a maintenance update, and it's available for both desktop and server versions, and for both i386 and amd64 architectures.
It's available for download at the known, official download page, here.