So, if you still use the 9.10 version then you have two choices.
1. Continue using it without the security or software updates (not a big concern actually for most of us, unless of course if you run a business that needs cutting-edge "features" and bug fixes).
2. Or, you can upgrade to the Ubuntu 10.04 LTS which would continue to give updates until 2013 (3 years cycle for LTS). You may want to keep few things in mind if interested in the upgrading process.