sentrygun here. I've been playing TF2 for a while (about January), and tried taking a crack at Hammer a couple of months ago, wondering what mapping felt like. Everything felt foreign and I gave up pretty quick, but I figure with help from other mappers Hammer shouldn't be too hard to get used to, so I'm taking another go at this. I also plan to take a crack at L4D mapping, but learning Hammer comes first (obviously). I can only hope this community is helpful in my map making effort and that I can manage to stick to mapping long enough to learn it and get pulled into it.