retro, change nothing! I love the colors, layout and professionalism that this layout displays. Really good work... only odd thing is the menu... maybe space it a little more so it equals the total width of the design.
Sorry, gotta agree with xharine, but to a certain extent. I don't think the problem is so much having so many diferent colors; it's distribution. Somehow, the different colors have to placed with more balance. The blue swirly pic is nice, but it looks out of place because there isn't any other place on the site that mirrors it. Also: for some reason, it kinda bugs me that the tabs aren't exactly aligned with your tables. Other than that, I really dig the layout and feel.
retro, yes I was referring to the buttons that span horizontally across the screen.
As for all the comments regarding color, I think it's just dependant on personal preference and age... obviously not everyone is going to like the design. I do suggest maybe taking some of these suggestions and trying them out... who knows.. might like it!!!