I did build a site in D6 recently but I did so knowing that the site would not be overly complex (functionally) or require anything other than basic CMS (views cck and blogs).

I am still a bit nervous about using D6 if the site requirements would entail many modules. There are still a lot of modules in beta or RC and even newer RC versions of Views was problematic for a while. For example, one site that I am doing requires eCommerce and I certainly wouldn't want to chance D6 with Ubercart yet... and how it may interface with other modules.

So, I guess I would certainly use D6 but cautiously dependent on the complexity of the requirements... or modules needed. Hope this helps.

As a general rule, if you can build it with D6 than do it. If not, fall back to D5. Both are solid releases and will serve you well.

Matt Farina
Geeks and God Co-Host
www.innovatingtomorrow.net
www.mattfarina.com

Let me just throw in my 2 cents from the past 6 months experience of building church sites with Drupal 6.

As of this second: No. It's not ready.

If you're building a blog site. Sure. If you're building a forum site. Sure. But if you're building a full blow community site with various features, I say build on 5. Now, that being said, I break my own rule. I build all my sites on 6 now, but unless you spend all day, every day, building sites with 6, you're not going to have the time to hunt down problems/solutions that you'll encounter/need to find.

So, at this point, save yourself a headache and build with 5 unless you're building something simple...that's my advice at least.

-Rob Feature
Geeks and God Co-Host
www.mustardseedmedia.com