Ok, so I dove into MobileMe yesterday at work (Win XP, IE 6, 1.8 Ghz C2D, 2 GB RAM). I had previously synced my contacts, e-mail, etc. from my Mac at home to MobileMe and to my iPhone 3G. All was fine. Yesterday, I was browsing through my contacts, and noted that I really should have a Group for my work associate's phone #s. So, I created a new group called "work" and moved the contacts into the group. The second thing I did was to create a new group for the van pool I'm in. Called it "van pool". One thing that was annoying, and this may be because of the browser I was using, it seemed that I could only drop contacts into groups that were visible when I first opened the window. I tried scrolling the list of groups down, but the last group that would highlight when I dragged a contact onto it was the last one visible when I opened the window. This is a problem when your new groups begin with "V" and "W"... Anyway, through some alignment of the planets, I managed to get the Work contacts into that group using Mobile Me on my PC at work. Never did get the van pool contact in at work. At home, in Address Book, it all worked fine. When I got home, I already had the two groups, and the Work group had the contacts. I just had to move the van pool contact into the group, and all was well. Now the interesting bit. Mobile Me and my Mac are synced. I can make a change on one, and it reflects back to the other after a short while. Works great. But my iPhone... I now have two empty groups called "Group Name" (a relic, I believe, of the fact that when I opened he new group in MobileMe's web app, they have no name), and an empty group called "Van Pool". No "work" group at all. The "Group Name" groups do not exist on either MobileMe or my Mac Book Pro. I've tried restarting the iPhone, but nothing. Mobile Me sync is active, and synced just 30 minutes ago. Any ideas?