ESPN has a series up today: Choosing your cornerstone, in which the question is asked:

Who's the better player to build a team around? Ichiro or Pujols?

Jayson Stark chimes in with Useless info which has this little factoid:

A lot has been made of Pujols' starting his career with four straight seasons of 120 RBI or more. But only seven players in history ever had a streak longer than that at any point in their careers. Not coincidentally, you can locate a plaque for all of them in Cooperstown, N.Y.:

Lou Gehrig 8 (1927-34)
Babe Ruth 7 (1926-32)
Joe DiMaggio 6 (1936-41)
Jim Bottomley 5 (1925-29)
Chuck Klein 5 (1929-33)
Jimmie Foxx 5 (1930-34)
Hank Aaron 5 (1959-63)

USS Mariner has a discussion in which the exciting prospect of 9 Ichiros vs 9 Pujols is discussed:

While, this doesn’t impact the debate much, but if you did have 9 Ichiros, the 3/4/5 hitters would have decent power I think. Maybe it’s unfettered fanhood that makes me think that Ichiro could hit a lot more home runs if he really wanted to, but I do. Not anywhere near as many as Pujols, obviously, but 9 Ichiros would still produce an awful lot of runs.

And your defense would be a lot better too. Who’s pitching? Because I have a feeling that a 9 Pujols team would be giving up a lot more hits on BABIP than the Ichiro version. Pujols in CF? That could end up costing a lot of runs. I’ve decided. 9 Ichiros over 9 Pujols. The smothering net of outfield defense is too exciting to pass up. And the joy that I would experience about that team winning is greater than the joy I would experience at the Pujols version winning.

I would watch Pujols in center field for the same reason I like slasher flicks: Sometimes you have to take your senses to the limit of gruesomeness they handle just to see where the edge is.

Pujols is clearly a better hitter and he's younger so I think if your objective was to win games he's the easy choice (The USS Mariner commentors agree) but if I were the owner of a team it would be very hard to turn down Ichiros incredible marketing power. The Mariners have Japan locked down and they have that entire revenue stream mostly to themselves. Pujols might be a better hitter but the money Ichiro makes you would give you the money to surround him with a much better supporting cast.