I have like 3 anti-virus programs running at once :)
That's actually not a very good thing...
But anyway,
Blockland hasn't really changed all that much. Duplicator and Fillcan are still basically the essentials. You probably already know this, but it'd also be worth getting used to building on slate Adjustable Plate is an awesome map- a lot of servers use it. It let's you make your own slate design without needing to open Mission Editor and make a new map altogether. Supports saving and loading, so that's always handy.
There are a few good mods flying around, but I'm not really paying close attention.
Don't forget to download JVS if you like that sort of stuff in your build. Some great packs out there!
Also, if you want server traffic, either get a dedicated through Kalphiter's hosting service, host your own dedicated or make some awesome, new and innovative.
Race Tracks seem to be all the rage right now.
Welcome back, by the way!