Blockland v0002 (AKA Vanilla Blockland) was the first online version of Blockland to my knowledge. In this version, everything is made to be LEGO-like. The player models, vehicles and bricks resemble those of LEGO. In this version there have been many mods that allow for stretching and rotating of the bricks, and build-through and floating bricks, to pretty much create anything you can possibly imagine. The only problem, though, is that most PCs have trouble holding many bricks on screen at once.
The most recent version was released recently, Blockland Retail or Retail as people like to call it (but shouldn't), and it is BLOKO themed. BLOKO is a knock-off of LEGO, with lower poly and less round, 'boxy' if you will, player models and vehicles, and the tops of the bricks have flat-topped pyramids instead of cylinder pegs like LEGO has. In this version, the bricks aren't .dts shapes anymore, they are created from purely text, and are less laggy aswell. This means less lag when looking at a bunch of bricks. There have also been a lot of modifications to the game itself so it generally runs way more smooth all around. There are also more effects in this version, such as particle emitters and lights and even a jiggly jello-like effect for bricks! One problem is, though, that you cannot mod this as much as you could in version v0002... you can still make vehicles and weapons mods and new maps and other misc stuff, though, take a look at the Add-Ons section to see what I mean.
This version costs $20 via paypal or credit card, and upon purchase you recieve a key through e-mail (there have been some issues with this but Badspot will gladly help you out), and with it you can unlock the free demo version up for download at any time. The demo version is just like the real version, except you can only build with 150 bricks, and you cannot play online.
Hope this helps.