One of the places I occasionally go when practicing is Guitar Shred Show. It’s the coolest online presentation of music lessons I’ve ever seen. It features a cute monk-like character who realistically performs every riff, and tab is given for every example. Try the “Mountain of the Tapping Dwarves” for some neat riffing that you can spend hours on.
Tonight I was going through a couple of those riffs and almost got them to the speed of Mr. Fastfinger himself!