>If I'm viewing an HTML page, is there a way to convert parts of this content into Excel or a text file? I'm thinking of something like putting an identifier start and end tag in my code, somehow pulling out everything inbetween after it's rendered, then parse it out to a text format. Anyone familiar with something like this?

I think what you're trying to do is called "screen scraping". If you search here or on Google you should get some hits.