Last month we started publishing the EOL dates of the supported versions of Snort from the official Snort ruleset.
Posted here:
https://www.snort.org/eol
You will now see that the EOL date for Snort version 2.9.0.5 is set for 2012-03-13, that's March 13, 2012.
As always, any questions about the Snort EOL policy can be directed towards me: joel@snort.org and I'll get them answered for you.
In order to subscribe now to the VRT's newest rule detection functionality, you can subscribe for as low as $29 US dollars a year for personal users, be sure and see our business pricing as well at http://www.snort.org/store. Make sure and stay up to date to catch the most emerging threats!