I had *many* people ask me questions that I was able to answer with a single google query. Sometimes, I would post the response on the blog, but even then it took a lot of my time and it was a point of diminishing returns for me, I felt like I was becoming
a crutch - "Oh i'll go google this or check the newsgroups in a minute, but first let me fire off an email to see if she knows."
If I know the answer off the top of my head, I will *always* respond - be that via a comment or an email. But if I have to research it at all, or fact-check something, then the chance of me responding reduces significantly.
I think that's the trick, really - it may seem like I know a lot because I post about it, but the truth is that I have my areas of expertise, just like everyone else. A lot of my posts start out with "I stumbled across this neat thing you can do in [name of
product]", too, so I just share things as I pick them up.
The Exchange blog had it worse, really... because that's where we were getting the "server down, help" type questions. Those are tough, how do you respond to those?
I decided it was better to set expectations that we wouldn't respond to email (but we ALWAYS read it), rather than let people infer that we'd respond and then be disappointed if we didn't.
Just to emphasize: we ALWAYS read it. Every day I learn something new about my customers and how they use my product, and although I may not act on that information that day, I file it away to be used at some point.