GMail and Yahoo Mail Comparison

As time passes, I'm getting to see Yahoo mail is making some changes to its service, but Gmail is still the same old Gmail.
what I'm seeing is about the new ymail interface and unlimited storage..

All gmail features such as google apps are completely no use, that's for me though, because I'm using email only for keeping on contact with friends, or registering other services such as forums, wlm, etc.. other than that nothing is done with my email.. I don't even use the features that are provided..

so I've been thinking of moving to ymail for the cool new interface and unlimited storage..
but I don't have any idea whether gmail will also make changes like ymail did, which I think won't happen.