After composing an email in Gmail yesterday, I went to the address bar and started typing in my wife's name. Normally Gmail would present me with a drop down of choices, but in this case, I was present with only her MSN account email. Strange? Until I read this on the MobileMe status blog.
Yesterday (Monday) morning a syncing bug was discovered which caused contact and calendar data not to sync properly over-the-air with iPhones and iPod touch. For some users this caused their contact and calendar data to disappear from their devices, but not from their computers or the MobileMe cloud.-- MobleMe Status Blog