I just updated to wordpres 1.5 and the liveblog broke. I could create liveblog posts and post updates fine, but these updates wouldn't be propagated to other users and on refresh it wouldn't be able to find the updates in the database. I think it may have had something to do with a null timestamp.
I switched to the master branch on git (now at 4e0dc12afa) and tried this version of the plugin and it worked.
It would be great if we could get a new release stable release providing support for wordpress 1.5