A quick update to let you know that Notcom has updated TinyUmbrella to version 5.00.04 with iOS 5 Beta 3 support. This update also seems to fix a visual bug that some users may have encountered in the previous version.
As usual, we recommend you download TinyUmbrella and save your SHSH blobs asap to avoid being locked out in the future. Obviously, if you're not a jailbreaker, you shouldn't care about TinyUmbrella...