There are two upgrade paths with Ubuntu, LTS to LTS (long term support)
which you are not using and normal releases. The last LTS was 10.04 and the
next one will be 12.04. Your choice is to upgrade through each version or
stay pat until you have to upgrade next April, then reinstall.
So you need a reason to upgrade.
If you want to try 11.10 which comes out October 13th then you must go
through 11.04 first.
There are no real problems with 11.04. Some don't like the default
interface, but you can still use the old one if you prefer.