Similar to the above, I've always had issues moving from section to section easily on phpBB.com. It is not immediately obvious that hovering on the menu will drop-down (perhaps some visual indication here would be helpful?), leading to an initial confusion as to the necessary path to reach content.
The same issues that are found with the Downloads page (multiple clicks required to get to anything pertinent) can be found in nearly every other section of the website. It is nearly impossible to navigate the Styles and MODifications sections of the website as they are essentially very large, two-column, un-ordered lists; this is obviously not condusive to quick scanning, an integral part of usable navigation. The same can be said of the Support section as well--however, it has far fewer items within it, making the list a bit more managable.
I also find the homepage to be somewhat cumbersome to navigate--as this is the landing page of phpBB.com, it makes sense to focus attention here to begin with, no? Even on my relatively large monitor, announcements and pertinent news are nearly pushed "below the fold"--instead, emphasis is on three rather large paragraphs that do not tell me much; it is simply an advertising speel, and not something particularly pertinent to anyone who would actually like to know what phpBB is
I do like the four small images on the home page, but again believe that the sections they point to need to be cleaned up--perhaps the sections should be edited to actually reflect what the images say? For instance, "what is phpBB?" leads to the About page, which includes a (needlessly?) detailed history of the project, but no actual information as to what the project really is.
I am also not a fan of the current width of the website (I've got ~300px on each side sitting empty which is mildly annoying), but given the header images are all static I do see that this will be quite a pain to rectify.
These are, of course, just my thoughts and suggestions; I'm sure the rest of you have excellent feedback as well. We'd love to hear it