About the lottery, I think there are only like 7-8,000 spots. I thinks its about < 10% to get in.
The accept about 50,000 entrants remember, a bunch of people don't show up. There were 43,000+ finishers this year.
The Manhattan half is on 1.24.2010 I believe. That's probably why the qualifying window end on 1.25.2010.
The NYC Half is on 3.21.2010 and is a pretty fast course. It is not $100 (at least it wasn't last year), but is $65 for members I think and $5 if you are not a member. Problem is that mid-to-late March can still have crappy winter weather in NYC, but it won't be 80 degrees and humid.