Hey Devonpeople,
A few days ago, I got my RSS feed from your blog announcing DevonSphere Express. I watched the video and it seemed very cool, but basically a souped up version of spotlight, albeit with quite apparent DT integration.
I checked the forum and saw a lot of problems some people were having with memory and the like, but I figured: You know what? It’s still brand new. So I got it anyway, as I’m addicted to DevonThink Pro and DevonAgent since August.
Have to say: I’m still uncertain how to use it effectively, but I am glad I got it. It has been useful a few times. The thing is that for five bucks, I couldn’t say no and I am expecting a lot more enhancements in the future anyway. As I see it, it’s a bargain. 
So I just want to post that I’m pretty darn pleased with it so far and I haven’t had any real problems with memory yet.
I know it sounds like a fanboy post, and it is.
As for the memory it’s using: 243 megs. DT uses 855 megs currently, so it’s not bad in comparison.
Anyway, thanks for the really interesting product and definitely looking forward to seeing more enhancements in the future.