I highly recommend Logical Volume Manager (LVM) for all EBS volumes, if your operating system supports it. Linux distributions generally do. It's great for several reasons.
Resizing and moving of logical volumes can be done live, so instead of the whole offline snapshot thing, which requires downtime, you could just add create another larger EBS volume, add it to the LVM pool as a physical volume (PV), move the logical volume (LV) to it, remove the old physical volume from the pool, and delete the old EBS volume. Then, you simply resize the logical volume, and resize the filesystem on it. This requires no downtime at all!
It abstracts your storage from your 'physical' devices. Moving partitions across devices without needing downtime or changes to mountpoints/fstab is very handy.
It would be nice if Amazon would make it possible to resize EBS volumes on-the-fly, but with LVM it's not that necessary.
