You can network through USB using a USB network cable. Price around 15-20 quid. Or connect through parallel/ serial if you laptop has these connections. Or why not get yourself a LAN card that sits in your PCMCIA slot. That way you will have fast reliable cabled network and internet connection sharing. USB network dongles by Belkin are good, plug and play. I have one for gaming, works a dream.
Lots of possibilities to connect laptops and desktops. Unless you have a good working knowledge of wireless networking, then i would go for .11g or you may find it slow with 11b wireless. I have 3 laptops and desktops and find wireless unreliable, go for a cable network, cheaper and reliable. Hope this helps.