Just wanted to let you know reading this post has made me feel sooo much better - we are in the same situation currently with my lil' Jack (8 mo old).
He just started boycotting naps - seemed to come out of nowhere. I re-read some of Tracy's book and she says that around this age they need an adjustment in their nap schedule that may take a few weeks to work out. Jack used to be a solid 3 nap a day (on the shorter side, like your lil guy) and was easy to put down. Always went down in his crib without a fuss. Then all of a sudden he started either completely refusing to nap in the crib or he would sleep but for no more than 15 minutes.
He is sleeping now, and its been about 15 minutes, so I'm keeping my fingers crossed and typing very quietly!
I have chalked it up to several things:
New teeth - just got two, and I think there are more coming
MAJOR changed in mobility - not crawling yet, but sooo close - and doing just about everything else to get around
He's realized there is fun stuff going on during non-nap time and doesn't want to miss anything
He is sometimes probably overtired/stimulated and we need to cool it a little bit, particularly around naptimes
Your post helped me see there are things I can do and I don't have to just give up and forget naps... he needs them, I know he needs them, and we are gonna keep working on it til we figure out what kind of nap schedule works for him now that he's changing so much.
Best of luck, and thanks for sharing!