I'm going to be travelling to Seattle in a month and would love to visit some swing clubs.  Anyone know of any there? Do any of you fine ladies want to join me??

Thanks for the lead!

It's not a traditional swing club, but a sex positive private club with many different sex focused parties. Bringing a date may guarantee results, but arriving stag (and hoping for the best) is ok too, which is not true of many swing clubs.  
Lots of BDSM and fetish focused parties, but several more vanilla options as well. (If you're on FetLife you'll be like a kid in a candy store here and will make many new friends).

I would be interested in joining you

Did that with a couple of clients in San Francisco - even had 2 reviews on it but they disappeared with MyRedBook site.

They may have a few parties for existing members who have attended the club before, however they aren't allowing first timers anymore. If you have means to make it to Club Sesso in Portland it's an excellent venue and a blast!