September 3rd, 2009 - Alpha 5 release
September 17th, 2009 - Alpha 6 release
October 1st, 2009 - Beta release
October 22nd, 2009 - Release Candidate
October 29th, 2009 - Final release of Ubuntu 9.10
And if u want testing the Karmic Alpha 4 on ur PC/Laptop, download Alternate CD at here or Desktop CD here too.
Happy