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I bought a Griffin Smartshare USB...it only has 2 ports, but I don't really use many USB devices in the first place. I'll be able to hook up an EVDO card and a USB drive at the same time. It's much smaller than any of the 4 port hubs as well, which was a factor for me.
 
I have the Belkin 4 port USB 2.0 Plus Hub with power adapter. It works well as I use it with two external HDDs, iPhone, and a scanner.
 
If you want more like a docking station, consider a 24" LED ACD. It has a 3-port USB hub built in. It also powers your MBA. Allows you to leave all of your wireless peripherals and USB devices at your desk. You can even leave your MBA's charger in your laptop bag. Just a thought... I love mine.

If you are really just interested in a USB hub, I would recommend any powered USB hub. Powered is the key when it comes to USB hubs. That should ensure any USB device you hook up will work.

Good luck.
 
wow, some of those are very PORTABLE! i like em, but i've been trying to find the smallest available with a built in ethernet. Anyone know of one?
 
I used the Kensington domehub for over a year. It was really great. It's weighted so it doesn't move around on your desk when you plug / unplug items. Now that my new Dell monitor has an integrated hub, though, my hub is on eBay :D.

Some of the Belkin hubs look nice too.

When you're searching for a hub, try and figure out what kind you want - one that is good for travel or one that is good for desktop use. The one i'm recommending is great for docking station type use. But don't get it for travel. If you're looking for a small hub, grab a 4 port hub that hangs off of a cable on eBay for really cheap.
 
I use macally dothub. It can be used with or without power. It also keeps with apple form factor. It's sharp!
 
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