I'm going to fetch a copy of the forum software and have a look at it.
So you're saying that if you are a "member", you visit and get a listing of new threads/posts but don't review them all before you leave, and that in such case the next time you visit all those unread posts will still be so marked? That's the way it works here; doesn't at AS, and it's off-putting enough (aside from the site itself) to not bother.
I got a kick out of this blurb on the "requirements for our software" (simplemachines) page:
"Additionally, JavaScript and cookies must be enabled for some features to work as intended, although efforts have been made to not require them."
Yeah, right. I had to look at the source of the main forestryforum page to see what the URLs were for the forums just so I could enter them. That as opposed to enabling javascript... It's about as quick to grab the rest of the URL from the source and slap it into the location bar as it is to enable js; going back to disable it again tips the scale away from that avenue.
By the way, every-Windows-one, there was another "zero day" serious exploit discovered in IE yesterday/today. See
http://isc.sans.org/ (it's a bloggy site, so it may have rolled off the first page in a day or two -- don't know, don't care too much). Even if you're running everything patched up to date it won't do you any good if you happen to click a "dirty" link. Good luck maintaining "owner"ship of your own computer!
I don't have a clue why I'd see anything different in terms of forum content using my dialup than you would on your cable/DSL connection, apart from perhaps less in any given timeframe.