Bitcoin Forum

I'm interested in a way to download all posts from a user (not me). This way, I would like to search one large document by date of post or by keywords.

You'll need to web scrap. Shouldn't be too hard, you can probably get by with file_get_contents and splitting strings

I could write a scraper and store the posts in e.g. a XML file.

PM me if you're interested.

https://bitcointalk.org/index.php?action=profile;u=67058;sa=showPosts
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Python
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Done with less than 20 lines

I am familiar with the terms Python, XML, and web scraping, but I have not actually used any of them. Any suggestions on where to start?

There's a difference between being familiar with the terms and being able to do it.
Basically your options are to either use this as a project to learn a bit about programming, or pay someone else to do it for you.

http://stackoverflow.com/questions/2190502/screen-scraping-with-python (http://stackoverflow.com/questions/2190502/screen-scraping-with-python)
http://www.crummy.com/software/BeautifulSoup/ (http://www.crummy.com/software/BeautifulSoup/)
http://scrapy.org/ (http://scrapy.org/)