I'm considering joining the PriorityPass program (http://www.prioritypass.com). The basic deal is that for US$299/year, you get access to a bunch of airport clubs, including some DL, NW, CO, AA, UA, and US rooms (plus a ton of international airports.)

For me the main attraction is that I frequently am stuck flying the airlines my customers have agreements with, not necessarily the ones I fly when I book my own travel. PP seems to give me a lot more flexibility than, say, the DL CR program.

I'd like to hear from those who have joined PP to see what y'all think, or if there are other equally flexible alternatives.