I'm assuming that you want to use the site as practice for talk about computer/tech issues.  If this is what you're looking for, then the closest thing is probably 価格.com (kakaku.com), which is actually a price-comparison search engine (similar to pricematch.com).  They have more than just computer stuff -- almost anything, actually.  Users of the site can post comments about each product, and it's very common to see people debating the merits/drawbacks of one item over another, as well as asking basic technical questions relating to compatibility, etc...

If you're looking to use the site as a study tool, do a search for an item you're interested in (i.e. SAS RAID コントローラ) and pick one of the products that come up.  There will be a comments section called "クチコミ" that you can click on to see everyone's comments.

Last edited by potempkin (2008 August 26, 8:57 pm)