Graduating this semester, currently using MobileMe. Here's my experience.
I have used google sync (contacts, calendar, email) + Dropbox (file storage) for all together, three years. That is a fantastic solution. The Google services work best when used via the website, not through apple applications (iCal/Mail/Address Book). When you try to use google services in Apple software, strange things are much more likely to occur. i.e. conflicting contacts, duplications, syncing not working correctly. Though when I use the web interface (I don't want to) the calendar works a lot better.
My experience with MobileMe for this past year and a half has been much different. Everything syncs perfectly. Since I have a MBP, iPad, iPhone this is important to me. Obviously, the made for Apple service by Apple works better.
Again, this is just my experience.
Here's how MobileMe helps me for college.
-Constant access to my bookmarks, snyc'ed across all my devices! (Google can only do this with Chrome and just on PC/Mac)
-Calendar, invaluable for project deadlines and homework due dates
-Notes, sync'ed with my iPhone/iPad and in Mail on Mac. I use this for my homework list
-iDisk (basically Dropbox) is extremely helpful. I can't tell you how much better life is knowing you have that term paper saved to the cloud in case of the old "my computer died/hdd died" woes. I love being able to read powerpoint slides/pdf documents on my iPhone/iPad while moving around too.
-Photo sharing is nice too, works great with iPhoto and provides alot of storage through MobileMe
Evernote is great too to keep track of quick notes or things you want to remember.