Yea, Blasted Lands has quite a few Scorpids roaming closely together. It's the most that I've seen so far, but there may be better places (only Lv57).
More info:
While you're there, be sure to get the quests from the two Bloodelves (the ones that ask for certain mob parts like Blasted Lung from Hellboars, Snickerfang Jowl from Snickerfangs, Basilisk Brains from basilisks, etc., etc. That way you can farm Scales and complete the 5 quests at the sametime. There are also a lot of skinnable mobs here (Felbeasts, Boars, Basiliks, Hyenas and Scorpids) and there all concentrated together. I got quite a few stacks of Rugged and Thick Leather here.
There are two more quests from Kum'isha that require somewhat rare dropped quest items, but all mobs in this zone drop these items as far as I know. I got a pair of Golem Leggings (which I sold for 60g) from one of Kum'isha's junk chests and 5 minutes later I got another pair of them from the nearby Ogres.
Those quests are repeatable, though the Kum'isha quests are the only ones worth repeating for a while.
There is another questline that is worth doing that starts here:
http://wow.allakhazam.com/db/quest.html?source=live;wquest=2783&locale=enUS
Once you have to free the slaves in one of the following quests, the quest will have you all over the zone (it's a small zone so it's really nice). Once you free all the slaves, you get a boat load of EXP. I did these all very easily as a Lv55 BM Hunter (though the Kirith part gave me a bit of trouble which was easily remedied once I killed guards and Feign Death'd and then killed Kirith alone).
These quests are all right there in the Blasted Lands and you can do them in a few hours time and get a ton of EXP and stacks of Leather to sell as well as your Scales. If you have Mining it's even better.
Something to think about. Might as well do the quests since you'll be there anyway. It's free EXP added to the EXP you get from farming and the quest items drop whether you have the quest or not, so might as well put them to use.