Well, biggest thing is it looks like your layers are off... I ran into this in Mozilla and IE. I attached a screenshot so you can see what I mean. It was better in IE then Mozilla, but it was still there. I have always had problems getting them to line up properly, and every browser handles them differently. (One of the joys I have with working with .net is it handles different browsers for you, so no need to worry about that

)
One thing I just noticed, not sure if you were aware of it or not, your calendar is not showing any previous days. Just today and forward. Not sure if it was intended that way or not...
Other small bug is the chief delphi tab isn't getting it's selected color. When you click on the cd link, the news tab is lit up.
The only other thing I will mention... these are the browser type stats from my website for the month of January. 92% of my hits came from IE. It only makes sense to make a site that will be compatible with IE.
no.: reqs: pages: browser
---: -----: -----: -------
1: 72382: 3707: MSIE
: 63455: 3218: MSIE/6
: 8919: 487: MSIE/5
: 8: 2: MSIE/4
2: 4803: 212: Mozilla
: 4133: 184: Mozilla/1
: 94: 5: Mozilla/0
3: 453: 42: Netscape (compatible)
4: 36: 26: Googlebot
: 36: 26: Googlebot/2
5: 345: 21: Netscape
: 237: 15: Netscape/4
: 108: 6: Netscape/6
6: 522: 18: Opera
: 518: 17: Opera/7
: 4: 1: Opera/6
Now, that's just the critism part... You've done a really nice job on the site so far. The biggest thing that I personally have problems with is making the site user friendly. As a programmer, I have in my head exactly how I want it to work, and I know my way around. The problem is that users can see what's in my head. I ended up buying a book by Steve Krug, called Don't make me think. He spends most of the book going through and talking about how users see websites... anyhow, the whole point to this... you've done a pretty nice job laying things out any making it easy to get around the site. There are probably a few things you could do to make it flow better, but that's the eternal struggle of a web developer. Check out that book on amazon though. It has quite a large chunk of it online, and it's a pretty short book. Lots of good stuff to think about though.