Ubuntu 5.10 will be released on October, 13th. In exactly one week :)
Today also the release candidate (RC) came out and can be downloaded on the Ubuntu website or via BitTorrent. The supported plattforms are x86, AMD64 and PowerPC. This is definitely the last version before the final version.
Take care: the CD images are bigger than 650 MB, so you should use at least 700 MB CD-Rs.
There can still be ordered CDs for the final version for free, see http://www.ubuntux.org/node/92.