i have to agree with nitishkunal. the overall design of your logo is blasé and difficult to read. Also, going glossy button on a flat colored site (except for the nav bar ... i'll get to that) doesn't look interesting or match anything else.
you have 2 different types of lizard on your site design (i would go with a style that is similar or just re-use one over again.) also, here is the confusing part (visually) is the lizard or your FU logo in fact ... the logo? because if i were to guess ... i would say the lizard since it's not only featured predominantly (BIG BLACK lizard verses a tiny white logo) over really anything else in the design.
the nav bar: there is a key to design that is important ... if you make only one thing a gradient graphic (nav bar or not) it will look ugly and/or out of place if used ONLY in that one spot. I would go with either a flat color (like the rest of your site) or make the gradient A LOT more subtle and use one somewhere else as well... also ... don't mouse over image the nav bar with another BRIGHTER gradient that REALLY doesn't match the colors at all. Just go for a different color text on the mouse over. oh and another thing about the nav bar ... if you're going to have a standard text on the graphic (no effects or non-web-standard fonts) don't put it on the graphic so you can change it later without alot of work.
colors: i like the colors, but they don't really make any sense. if you use a color one place ... you should use it in another place as well. for example: you have a neon-lime color, midtone green, pale green, cream color, a green that is somewhere in-between the pale green and cream (the second lizard), white, black (mainly in the text but the LIZARD is predominantly the main use of this) and 2 shades of grey text + the background color of brown (which is re-used in one odd place ... in the left hand column on one line) .... if i were you, i would try to limit these colors down a little or use them somewhere else. if you use a gradient instead of going from white to green go from one green to another. if you use one on a lizard use it somewhere else as well. Also, don't be afraid of borders on your content (whether it's the main content of your site or the outside which will help to frame the entire site from the background) and lastly, that cream color doesn't match at all, maybe go with something a little less contrasty and go with a more grey-rich color like you did with your most prominate green (the one from the header and main content area)