If the VIN is a good indication of where in the production cycle my 2004 R1 was made, I think it's an early one. The last digits of the VIN are A000008. I took delivery in the first week of April, about a month ago, and have put about 1600 miles on it. I noticed an anoying drag in the clutch before changing the oil at 750 miles but, after that, it became a real pain. After reading posts on this site, I did two things and the problem is almost gone.
1) I warmed up the bike in the evening, shut the engine off, tied the clutch lever to the grip and leaned the bike over to the right side supporting it with my knee against the tank. After holding this position for 15 or 20 seconds, I put the bike back on its side stand and left it alone over night with the clutch lever still tied to the grip.
2) I went for a short ride and got all the way up to 6th gear going about 35 MPH and feathered the clutch - getting the rpm level up arount 5 or 6K.
I did both of these steps twice, and it feels much better.
Another thought is: if you are doing an oil change anyway, perhaps over filling the crankcase, tieing the cluch in the disengaged position and letting it sit over night before draining the oil and refilling with the correct amount would do the trick. With more experiance, I probably wouldn't hesitate to remove the clutch plates and soak them myself, but everything is working so well now that I think I'll just ride.