I recently (ish) found a site called The Let's Play Archive and have been enjoying it. Mostly games that I've played before but enjoy watching - I thoroughly enjoyed AccountingNightmare's LP of Devil May Cry and VolcanoStyle's LP of Ratchet and Clank.
Does anyone know of more actual LP sites like this? I can find things on Youtube etc... but an actual site that this is decent is much better.
I'm also considering trying my own Let's Play. It was going to be Assassin's Creed but I'm halfway through that now and I didn't actual record any of it :p