@Link Ah yes, Vicas and company- that was a great LP. If you want some more yelling and good fun, watch the Mario Party LP by pokecapn. I also recommend checking out chorocojo's pokemon LPs (Emerald->Crystal->(Quartz by Zorak)->Platinum) as well as Lt. Danger's NWN2 lp. That'll keep you busy for a few weekends.
As for a good game to LP- Serious Sam, Terraria, Magicka are all great games that could be done in multiplayer that could end up with some great fun. And that's just from a quick glance at my steam library.