Looks like Watchout reworked them to include the pre-regional era. Here is the new lineup. Not much different.
Boys:
234.82 North Central WA (wasn't invited pre-2007)
238.36 Fayetteville-Manlius NY (wasn't invited in 2006, but finished 3rd in '05 and 2nd in '04)
244.55 Christian Brothers NJ (wasn't invited in 2006, but finished 8th in '05 and 11th in '04)
247.55 York IL (10th in 2006, 2nd in '05 and won the inaugural meet in '04)
263.27 American Fork UT (wasn't invited pre-2007)
268.00 Arcadia CA (wasn't invited pre-2007)
285.00 Albuquerque Academy NM (7th in '06, and 10th in '04)
286.64 The Woodlands TX (12th in '06 and 7th in '04)
289.18 Royal CA (2nd in '06, 6th in '05, 4th in '04)
290.27 Mead WA (hasn't made it in the NXN Regional era, but was 5th in '06, 4th in '05 and 3rd in '04)
Girls:
123.18 Fayetteville-Manlius NY (Won it in 2006, wasn't invited in '05 or '04)
187.18 Saratoga Springs NY (Wasn't invited in '06, finished 2nd in '05 and won in '04)
258.36 Fort Collins CO (wasn't invited pre-2007)
262.09 Saugus CA (18th in '06, wasn't invited in '05 or '04)
271.55 Southlake Carroll TX (3rd in '06, 3rd in '05 and 8th in '04)
272.64 Carmel IN (wasn't invited pre-2007)
282.00 Tatnall DE (12th in '06, wasn't invited in '05 or '04)
292.73 Wayzata MN (wasn't invited pre-2007)
293.09 Yankton SD (5th in '06, 5th in '05, 3rd in '04)
296.00 Hilton NY (2nd in '06 and won it in '05, hasn't qualified during the regional era)