I've been ripping a bunch of our DVDs to AVI for my dad's media center, and I copied them over to the media center last night (About 10GB of data), and I was downloading loads of WMV HD samples as well to test performance, and the router kept screwing up and not accepting any new TCP connections (Even to itself).
So, I got the latest Linksys firmware, which didn't work very well (I could only download at about 100k/sec on a 4MB line), but at least it seems to have stopped crashing.
SHilbert was saying he flashes his Linksys router with DD-WRT, so I decided to give that a go. And it's awesome. The router works great, you get billions more options (And I only have the "micro" version of the firmware, which has the fewest features), and I can look at things like the amount of free RAM in the router, buffer sizes, TCP connections, and other cool stuff.
So, if anyone else has a Linksys WRT54G router and feels like an upgrade, have a look at This.
And, mandatory screenshot time: