Title says it all. I put my HTM-200s on the wall, using BTech BT-33 wall mounts and the beefiest drywall anchors Home Depot sells. Solid as a rock.
First of all, David F. was right when he said the BT-33s are good design. They hold the HTM-200s without any drama. You just use the provided allen wrench.
Second, normal drywall holds these up. I used the biggest anchors Home Depot sells, but they are probably overkill. This is great, because I was able to put the speakers in exactly the right places without worrying about hitting the wall studs. Took me about 5 minutes to put up each speaker. A big plus for the HTM-200s, in my opinion.
I was cranking some music last night at ear bleeding volumes just to test things out, and I gotta say, these little things plus a subwoofer sound great! I've listened to a lot of nice speakers, and whatever they may give up to the 170s and 340s is made up for in convenience for me.