i've installed FC5 on a relatively ancient Dell Inspiron 3800 and relatively newer Dell Inspiron 600m. both installs and setups went painlessly.
re: wireless issues - i use an old linksys pcmcia wireless b card with the 3800 and fc5 recognizes the card right away when setting up my wireless connection through Administration --> Network. for the 600m, it recognizes my internal nic (not sure about its technical details off the top of my head) but i still use wireless connectivity via the laptop's intel pro 2200bg chip. that did take a little bit of research to get working since it needs drivers and kernel modules, but in essence, followed the advice given in this link (
http://fedoranews.org/cms/node/478). just make sure you download the appropriate rpms for your current kernel version. after that, setting up the wireless connectivity was another piece of cake.