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I'd recommend making the design a little more "welcoming". It's very bare and plain - makes the site look cheap which reflects on the service. I'd also recommend simplifying the information and features on the home page - try to really get across what your app does, what it will help us do, and why we should use it, as quickly and easily as possible.
Drupal can create boring blogs like wordpress...but what about it's power to create something like...umm...a SaaS Business Social Collaborative Application?
Drupal, especially if you have any development experiences or real customization needs. It can be modeled to do anything - yes, I mean anything at all. I've developed some amazing applications using Drupal - not just the typical 'blog' like site that the others generally create. So it depends on your needs. Drupal also has, what I think, is the best community out there - tons and tons of modules, themes, support, customizations, tutorials, etc.
I really don't want to mention our product again on the same page, but you mentioned Drupal, which is what we built our, I guess I have to say, Sharepoint alternative: OfficeMedium ( I won't spam another link on the same page )
I think we're on the same page though: Simplicity is key.
Too many? I don't like to sound like I'm "spamming" out my product, but I believe it's designed in such a simple manner than anything included that you aren't interested in using, sits quietly in the background.
Google lists other sites but they have a little more kick behind it.