Filesystems

Here is a good article about Linux filesystems implantation from IBM Developerworks

Ubuntu and wifi

Here is a link to an article which says that on Ubuntu it is necessary to uninstall network manager and install Wicd to make some wireless cards working:
http://itmanagement.earthweb.com/article.php/3709051
And here is an article about Wicd (polish)

Here is a news thread about problems connecting Realtek WiFi cards to WPA network:
http://ubuntuforums.org/showthread.php?s=b532066aaf2a4399488b4d9276d438f6&t=419806

Site with linux Wireless cards list (with chipsets): http://linux-wless.passys.nl

Some discussion about DWL-G122 and rl2570 driver worth reading:
http://rt2x00.serialmonkey.com/phpBB2/viewtopic.php?t=2949&highlight=dwlg122++wpa
Drivers download site: http://rt2x00.serialmonkey.com/wiki/index.php/Downloads