There isn't an easy way to keep up, unfortunately. Threads you respond to will automatically be watched, which is helpful for less active things that get buried. If you click the little blue box under post count that says "number new", it'll take you to the first new post - which still makes things messy if you have the forums set to nested.
Idk, the forums there are way too fast for me. Too much noise, not enough signal.
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In other news: I'm breaking in my new wrist braces. I have a feeling I'll be needing them a lot.