It depends on what you expect to do with it. My wife and I have .Mac, and feel that it's just barely worth the money (therefore we just renewed earlier this month). We both use the email accounts (hers is an added email-only account), I upload pictures via iPhoto, sync data between the two Macs, and upload certain important files for offsite backup (using an encrypted disk image so nobody at Apple can snoop my stuff!).
We haven't looked into the new groups feature yet (might be nice for communicating with family?), and we don't use the bundled Backup application only because I'm very technical and like to do it my own way.
.Mac is definitely not for everyone. Free email with more storage is easy to find (Yahoo, Gmail, etc), and sites like Yahoo do also offer picture uploading and group features for free. The key for me is the integration with Mac OS X.
I particularly like the iPhoto integration for uploading new pictures. As I said, I'm very technical, and I used to do all my photo web pages myself. I had unix perl scripts to resize the images, generate thumbnails, and create a basic html template that I'd go in and edit. But all said, it still might take me 30-45 minutes to put up a roll of 30 digital pictures. With iPhoto, it takes about 5 minutes. Even though I have much less control over the final product, it looks good and the time savings is huge for me. And one great thing about iDisk access is that I can go in and edit the generated html if I want to tweak it.
I do wish they'd provide more themes for picture pages - the ones they have are good, but for $100/year I'd like to see more.
They've offered some nice .Mac-only downloads in the past - a few cool utilities and application add-ons, but it seems like the frequency of these has gone down. Again, would be nice if they'd provide a bit more in this department.
All in all, I can't say that it's an amazing value, but again we feel that it's just about worth the $100/year, so we've stuck with it. Though in reality it's a bit less, as we usually buy the .Mac box from Amazon.com when renewing, which is usually about $78 or so.
Hope this helps.
