WNFF and Talk Nats would not be a great match because both sites are already very popular and there is no reason to mess with a good thing. What both sites could do is minor tweaks to copy what works with the other site. I'd like for Talk Nats to separate topical threads from game day threads so that conversations on a particular subject can continue for multiple days. WNFF could create another Group of boards (like Community) and create boards for individual bloggers to post long form entries. Then invite some of the independent bloggers to use WNFF as their host site, adding to the WNFF content and providing a lot more clicks than some of the lesser known blogs receive.
Actually, PB, it might be a really powerful site if we did merge. Take a look at Sons of Sam Horn's .com website and .net message board. They complement each other pretty well. You might draw even more traffic if the combination became more widely cited as a go to for Nats (the ExxonMobil, not the SearsKMart, of fan sites). Who knows, maybe some folks like Evol and Brian from Nats farm might decide to add in what they have.
At various times, Squab, Houston, and a few others have kicked around with The Chief the idea of opening a companion blog to WNFF. It's labor-intensive. The idea of merging with a well-run blog, with its own staffing of the blog area, might be a quick jump start to this.