PSUbuntu forum user stovenator has custom compiled a 2.6.22 kernel that provides better WiFi, gives partial BluRay disc support, reduces the ejected disc problem, and might also give you access to controllers via bluetooth.

Instructions and information can be found in this forum thread.

Colin Watson just released a new, customized Feisty Fawn CD image which should eliminate the installation bugs and issues that has been reported on this site. Specifically, it applies some patches that makes the partitioner avoid the incorrect (”newworld”) warning messages, stop some non-essential processes (that made the installer halt at 15%) and fix the kboot.conf device naming problems.

Direct download link (desktop CD).

The latest issue of Free Software Magazine has some instructions on how to install Mediatomb on a Ubuntu box. With Mediatomb you can stream your media to the PS3 using the UPnP protocol, which allows devices to connect seamlessly and simplifies sharing of media. If there is a compatible UPnP server on the network, the PS3 will automatically detect it.

The article can be found here: UPnP, Mediatomb, PS3, and me.