I tried Googling for a good paddling discussion forum without much luck. I found one or two, but nothing that stood out as both nice and active (like ExPo).
I've been on paddling.net for sea kayaking and boatertalk.com for white water for about 9 or 10 years now, and yahoo groups whatcompaddlers for surf ski racing off and on for a couple yrs.
What was your screen name on paddling.net? I go by "Sternsquirt".
I'm a bit biased (it's my site) but we've got lots of experienced paddlers on the site (mostly sea kayakers). Although the site is mainly about British Columbia, you'll find tons of general paddling information.