Once upon a time, we had 5.2.
Then, to incorporate Falcon, it became 6.0.
Somewhere along the line, there was a 5.3.
Then a 5.4 appeared which seemed to be 5.1 with performance fixes for InnoDB.
Now there is a 5.5, which claims to be a 5.4 with a few stuff added.
Stop confusing your community.
And whatever happened to community participation?
People would like to know.