Glad I had set up a Skydrive account before a number of months ago... I played around with it a bit, and used it to access my OneNote file from the Mac, but honestly, with Skydrive, whatever the heck Windows Live Mesh was (never did figure that out), etc, I just stuck to Dropbox. It was simple, and it worked on all the platforms I had access to.
Today, though, MS released an iOS update that added a Retina-capable iPad client, a Mac OS client, and announced that current Skydrive users (prior to 4/22) would get 25Gb of storage. That got my attention! So I checked out the iOS and Windows clients, and sure enough, it can fully replace Dropbox for me, but with lots more storage.
If you had a Skydrive account before today, head up to https://skydrive.live.com/ManageStorage and click the button and you can upgrade from 7GB to 25GB free. If you're a new user, you'll get 7GB free.
I just moved my Dropbox folder into my Skydrive folder. :) You can actually run both and point Dropbox to the folder inside the Skydrive folder if you want.
There's no Android client. I'm not sure if one is planned or not, but there are a couple of very popular third-party clients for Android.
Anyway, mainly wanted to share the 25GB upgrade link with you guys -- not sure how long that will last.