I picked up Hitman:Blood Money last week, and I have to say I'm really impressed with it so far. I have the first 3 games as well, and I think one is probably the best. They've greatly expanded 47's available actions. You're now able to do things like punch and head butt, disarm people, use lethal and nonlethal syringes, push people, and dispose of bodies in conveniently placed dumpsters, crates, and other containers.
The levels I've seen so far have all been a lot of fun. There's a wide variety, and they look really nice. One level is a suburban neighborhood where you have to take out someone in the witness protection program. Another takes place in New Orleans during Mardi Gras.
They also brought back something I've missed from the first game: you actually earn money from your missions. You can use your cash to buy upgrades for you weapons (such as silencers, different types of ammo, etc) or yourself (such as a health boost). You can also spend money to pay off witnesses, which lowers your notoriety rating.
Another nice little feature is after each mission, you can read the front page in the paper, and read all about your work. The articles change somewhat to reflect how things actually went. For example, it will mention the number of bullets fired, the types of bullets used, or whether or not there were any witnesses. If you look closely, you may finds some other interesting things as well ;) :
Anybody else playing this game? If you are a fan of the series (and even if you're not), I would recommend trying this one. I believe there's a demo available as well.