Well, lava and zombie were shutdown on 30th April 2013 due to 9001 issues, mainly popularity withering away.
TNT was replaced 1st April 2013.
At end only Blocktopians were playing here.
Soo hi. Blocktopia changed DRAMATICALLY since early 2011. Most people you met back them either left or are inactive.
Well GmK, Malcovent, Davidjl and Mikey are most notable exeptions.
Also you missed 10 or so various servers
Here is history of Blocktopia:
http://blocktopia.net/forum/threads/the-timeline-of-blocktopia.9607/
We have all recaps since August 2011.