An obvious choice is that you could use the form widget as a guest book form on your blog home page, or as a survey/poll on your homepage (even at the post level).
If your blog didn’t have a comments function (most do) what about using it as a comments form for each blog post…you’d have to work out a way so a new form automatically appears for each blog post.
What is handy is that the same form you enter data in also doubles up as a search form…there’s not one blog I have seen where you can search in the comments of a blog post, handy for Techcrunch who amass hundreds of comments in each blog post.
Then the idea would be to be able to search comments across all your blog posts…I can do this in my blog admin area, but my visitors don’t have the luxury.
The next step would be to go bigger, if a network of bloggers used a comments widget (and used the same fields), maybe somehow they could merge their widgets, so you could search the comments across a batch of blogs…kind of like what Rollyo does for the body content.
This isn’t leading to a comment search engine is it…
If you are pointing to a comment discussion on a blog, you could point to the comment on the form results page (not sure if each comment has a permalink yet), but this is nothing new…what you could also choose to do is just embed the comment form from that blog post in your blog post.
eg. You are writing about a blog post on TechCrunch and you are referring to lots of comments left on that post, as well as linking to the comments, you could also embed the widget in your blog, so the readers of your blog post could search the TechCrunch comments for that post and even add their own to the discussion.
Another idea would suit those types of blog posts that review a distributed discussion
eg. blog A said this, then blog B responded in his/her post by saying this, then blog A posted again, then blog C posted and so on…just check out BlogPulse conversation Tracker…more.
At the end of this review post you could enter all the links from the distributed discussion into a form widget and embed it in your blog post. This way after reading the blog post people could do a blank search to see the discussion list or just plain old search the discussion.
NOTE: BlogPulse Conversation Tracker could include a search option to search across all blog posts in the discussion.
I have posted on similar list type form sites like ListRing, and FLEXlists…this comes close as you can share the read/write version but it can’t embed a widget or search…whereas WyaCracker has all of this by default.