The Flash Player plugin in my Google Chrome browser keeps running out of memory and crashing, forcing me to close down and restart my browser, even though I'd like to think 8GB is a pretty decent amount of RAM for a Windows 7 x64 machine these days. I do tend to have a lot of tabs using Flash open at the same time, but it shouldn't be hogging all that much memory to load those Nico Nico Douga videos.
Also, what's up with Chrome not having a session saver function built in? "Bookmark all tabs" only works on individual windows as well.