Amateur Radio Services of:
The Linksys WRT54GS WLAN-Router is a powerful cheap device useable for hamradio. It is about 75,- €, but you have to care which subversion you buy. Please check http://openwrt.org and http://www.seattlewireless.net/index.cgi/LinksysWRT54GS for further details about flash memory and capabilities to use OpenWRT.
Arsene, LX1TB has modified the Linksys WRT54G(S) models to tune the frequencies below 2400 MHz for better fit with the hamradio bandplans Look on his german website to get the details: http://www.rlx.lu/~lx1tb/wrt54gs/.
The WLAN-Router has a MIPS 200 MHz CPU, 32 MB RAM, 8 MB Flash, WLAN 802.11b, a 5-port switch and 2 serial ports which have to be upgraded by hand (without hardware handshake). See http://www.rwhitby.net/wrt54gs/serial.html for the serial modification. The ports support up to 460k8 serial transfer rate !!
The WRT54GS for hamradio usage has been presented at the 21th international packet radio meeting in Darmstadt, Germany. There's a German summary available: Packet Radio Tagung 2005 (nice pics if you can't read German ;).
Some useful hints for hamradio operators:
Adding an SD card reader to the WRT54G: http://kiel.kool.dk/
73 de DG8NGN, DL5RB & DL9SAU