This is an exciting piece of work and I feel a resonance with this technology that I didn't feel in Joomla or WordPress or DNN. As a kid I loved to play with my Erector set and as a grownup I loved the Lego techno sets. I've been building web sites in html since 1996, and I have this strong sense that the Drupal approach is the road of the future. But:
It would be helpful to newcomers like myself if the array of available modules were better organized and presented. It's fine that one can filter items by Drupal version (5, 6 etc.) and by project, but it's still too much of a jungle. Here are some suggestions for upgrading the display under the Download|Modules tab:
1) Highlight the handful of modules that provide the greatest all-around functionality. For example, Views, CCK, Wisywig API. Make it clear that these are basic building blocks. Right now, the display buries for example the CCK module unobtrusively in a laundry list of lesser pieces having more elaborate displays. There's no way to tell, without plowing through reams of documentation on other pages, that these modules are in a class by themselves. Put them into a primary list, or put them at the top of the list, or display them in some other distinctive way so that users can quickly appreciate them and find them.