A weird bug report, I know... please, read, I'm not drunk :)
I found a strange bug while downloading by torrent: system freezes after 2-5 minutes since download's beginning! Using Jaunty 2.6.28-16 on x86 with backports enabled and ath_pci driver from SVN 22 Oct. 2009.
I rebooted with the old kernel (2.6.28-11+backports, "original" madwifi drivers) and works fine, no freezing!
I've tried different clients with different engines, so I think it's a kernel module problem. On the other hand, downloading by HTTP/FTP is ok even at high speed (500k+/sec).
I'm using a TP-LINK WN551G PCI on a WPA wlan.
Daniele