Here we go!
Airports:
AMS
SXF$
PHL
IAD
ROC
STN$
SAN*
IAH$
EWR*
ORD
$ - new to me
* - new since I started keeping track of these things a few years ago
Ground/Public transportation companies/organizations:
NS & Veolia
Connexxion/Breng/GVB/etc.
RET
SNCBEurostar
Deutsche Bahn
Brussels Metro
SEPTA
San Diego MTS
Chicago CTA
Amtrak
London Tube
Stansted Express
At least one other British train company
Hotels:
Citizen M, Amsterdam SchipholLe Meridien, PhiladelphiaCascade Louise Hotel, BrusselsBest Western, Rosendaal
Hotel Zuiderzuin, Egmond aan ZeeRamada Inn, Geneva, NY
Mission Valley Resort, San DiegoHotel 't Keizershof, BrugesStan en Land, AlkmaarB&B Bij Het Strand, De Koog Destinations, or "non-Nijmegen places I spent the night intentionally"
Kassel, Germany (for New Year's 2010-11)
Brussels
Koeln
Muenster
Berlin
Philadelphia
Rochester
Corning
Geneva, NY
San Diego
London
Washington, DC
Bruges
TexelAmsterdam a bunch but that's barely interesting:)
Chicago
Sorry, too lazy to include links to everything this year. Anybody know if I missed anything?
Oh, and I lived in 2-3 apartments, depending on how you count something that was somewhere between "crashing" and "subletting".