The Wii is selling higher numbers is due to supply issues finally being resolved, and a backlog of demand to be fullfilled.
The 360 #'s maintained higher # of sales with the introduction of the 360 Elite, many people traded in systems toward Elites (trades do not deduct from sales)
The PS3 had no benefit of either of those factors, that would help explain the larger drop off in sales, both the Wii and 360 were down ~18% for the same time frame the PS3 was down 30%.
I own a Wii. I am buying a PS3 this month, and OWNED a 360 until late last month when i traded it in for credit to but toward my PS3.
The reason for my trade in was that my 360 was showing some of the same issues that it did previously before it died, but was still working, I didnt want to pay for a repair, or go thru all the hoops to get it repaired again. I also wanted an option for HD movies, and I could either spend $200 for the HD-DVD ADD ON to my 360, or trade it in use that same $200 to get a NEW Ps3 with BUILT-IN Blu-ray & Built in Wireless for networking.(Thru a good promotion I got $380 in trade for my 360 extra controller and 2 games)
If you look at all the features of the ps3 vs the 360 , it is actually CHEAPER than buying the 360 and adding the HD DVD and Wireless adapter. I hate when people don't compare Apples to Apples. Yes its expensive, Yes they should cut the price, BUT, you do actually GET SOMETHING for the money if you compare everything on an equal playfield.
so looking at the 3 systems, I see it as:
Wii - Fun games(limited selection), below average graphics, reasonably priced. A great system with innovative ideas, I love it.
360 Nice selection of games (12 month head start on competition), great graphics. Missing a key component that is in the competion (built-in wireless), ability to add-on HD DVD ($200 - ($100cheaper than stand alone)) BEST SYSTEM for pure gaming purposes, if you dont mind risking the system death issues that seem to plague this system.
ps3, limitied games, great graphics, higher up end potential for future games (Blu-Ray storage), larger Hard Drive, Next Gen Movie Player (much cheaper than buying a stand alone Blu-Ray ($200 savings) much higher up front costs as everything is built in rather than upgrades.
Now, If the Blu-Ray/HD DVD option is Important, the PS3 is actually the BETTER buy, more bang for your buck. Gaming wise, I would put it on par, with the exception of a lesser library at this time.