Those 3 sites are sharing the same Round Robin forum, so to participate in the discussion you only have to register at one of the sites and you will gain access to the Smartphone Round Robin forum at all three sites.
Mike over at PhoneDifferent.com DOES have the BlackBerry Curve this week, so I'd recommend that as good starting site to visit and jump in on the discussion from.
having the forums integrated confuses me lol, I loginto one site and have a look to comment, and then look around and then I find myself commenting on the same forum I already commented on when I viewed the other sites, due to the fact when you login some of the forums are hidden from each others sites and some are not, ahhh....I think i just went crossed typing that and trying to explain to myself when typing it to explain to you all...lol...but either way check out as many of the forums as you can, cause their are some good comments and thoughts going on in them, def a fine read to see who is having what likes and dislikes about the devices they are testing.
Yes, the forums for the other sites are integrated. If you're looking for one site that shows you all of the various forums (with the exception of CrackBerry.com...it's special and has its own), I recommend you go here:
If I'm not mistaken, you can register one time at either TreoCentral, WMExperts or PhoneDifferent and thereafter log into any of the three sites. The only one of the four round robin sites that requires a separate/stand alone registration is crackberry.com and that is probably because it was acquired by SmartPHoneExperts after it was already up and running - would be nice if our registrations here could be ported to the other sites, but its possible multiple people would have the same screen names.
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