I found another cool web resource today:

http://www.fly.faa.gov/Products/Code..._Preferred_Rou
tes_Database/nfdc_preferred_routes_database.html

It's the database of IFR preferred routes. There's a fairly basic
search page, or you can just download the whole thing as one big text
file. Yet another reason to not bother buying the AFD :-)

Anybody know what "Route Type: L, H, LSD, HSD, SLD, HLD, TEC" means?
TEC is obviously Tower Enroute Control, and I'm guessing L and H are Low
and High (presumably above and below 18000), but what are the others?