If the rumors are true, i'm hearing Sony will release a "motion-controller" this holiday, bundle it with the PS2, and sell it for $99. That could make things very, very interesting.
Software sales are a different story though. The Wii and DS continue to dominate the top20 lists. In June's Amazon list, there wasn't a single PS3 game in the top 20. That's amazing considering it's a new console with new releases and very bad news for Sony. There were a few PS2 titles though, and they're lucky in that the PS2 is a cash cow. It was similar when the PS2 came out...not a whole lot of software the first year, except for SSX.
Help is on the way, the question is will it be too late? The exclusives -- Final Fantasy, God of War won't be around til next year. Up until now, Sony enjoyed the best version of the multiplatform games, as they were typically coded for PS2 and ported to the others. Even though the Xbox was more powerful, the graphics were only marginally better, and sometimes even worse, with framerate hitches, etc since the engine was optimized for PS2. The reverse is happening now....Madden and NCAA football run at 60fps on the 360 and 30fps on the PS3 even though it's a more powerful machine. Gears of War and Bioshock look as good as anything i've seen on the PS3 thus far.