I've been playing around with it for a bit, and I like the way it does filters.
You can filter files by type, privacy, and ownership when looking through your stuff. What's cooler is that these options work together as tags in the search field, letting you get even more specific about what you're looking for. For example, if you're looking for shared images, you apply the type and privacy filters to give you the files with those settings. Dropbox sort of does this with shared links, but this goes a step further.
Also, the collaboration aspect is neat. You can only do so if you convert a document to Google's proprietary Docs format, but this is completely optional; so if you're not the sharing type, you can simply leave your documents in its original setting. And even when you are done collaborating, you can then convert the Docs file into a standard word document so you can work offline. OR you can install a Chrome extension to work offline in Google's Docs format. So you have options in terms of how you want to upload and collaborate.
And of course, just like in your desktop, you also have the ability to search all the files you have in the web client in case you forgot.
You can even sort your files by size on the web, letting you delete stuff taking up a lot of space.
Not bad so far. Not bad.