Getting Help

My post New Work is about changes in work skills. One of the bigger changes in work skills have to do with getting help. I looked at a couple examples this recently in LinkedIn for Finding Expertise and Searching for Expertise - LinkedIn Answers

This topic came up again in a discussion - Blogging to ask for Help - Colin asked:

If you need input from like-minded people around the world, where's the best place to ask?

Today I posted a request for reader input in my blog because I didn't know where else I could ask for help from people outside my company. Is there a more effective way to approach this kind of problem?

There's some interesting discussion in the thread around whether it makes sense to post a question in a blog. And some alternative places were suggested for getting help. Some suggestions:

• Discussion groups (TrDev, ???)
• Ning or LinkedIn Groups
  
• LinkedIn to find individuals
• LinkedIn to ask questions - via Answers
  
• Twitter (only if you've participated quite a bit)

The issue with Twitter and posting questions through a blog is that you only will get responses from your existing audience.

Am I missing any options here for getting help?

Are there good resources for helping someone know how to use these things to get help?