Just wondering if it's possible to utilize the tags of flash file in the search. Thus far I haven't found a way.

For instance would it be nice if I could search for "Platformer" and then get all files that were tagged as "Platformer" instead of only those that have Platformer in their name.

Biggest problem is that almost only porn flashes are getting categorized by people at the moment, and I figure it will be the same with tags when they are implemented. So even though there is a "platformer" game category there aren't many flashes in it due to nobody bothering to tag games...unless they are pornographic.

What you could do is browse through the pages at:
http://swfchan.net/categories-gameclean.shtml

Then press CTRL+F and search the page for "platformer" locally in your browser. Just remember that there are many platformers in the game category right now that hasn't been categorized as such by someone and therefore won't be highlighted by your browser's page search (and there are tens of thousands of platformers in the whole archive that hasn't been categorized as a game so they won't even show up on those pages).

To sum it up: Even if searching was available for categories today there wouldn't be many hits for "platformer" because most people are here for the porn and thus many games doesn't get categorized properly.