[jyl]

What they said. Buy a Linksys 4-port router + wireless access point (AP) using 802.11b. Not g. Appx $120. Run a cable from your DSL jack, place the Linksys AP in a central place in the house. Buy a Linksys 802.11b card for each computer - a PCMCIA card for notebooks, a PCI card for desktops. Appx $50 each. Configure to use WEP (security) if you care, if you are reasonably far from your neighbors then I wouldn't bother. Will allow you to go online wirelessly from anywhere within appx a 100 foot radius (depending on obstructions).

The reason I say b not g is that b is already faster than your DSL connection. So unless you plan to transfer large files and stream video between your home computers, g doesn't get you much. And the b equipment is cheap. If you can't find it then g is fine.

You can also use a Linksys wireless print server to be able to print from any computer to any printer, but it is a bit fiddly.

Nothing special about Linksys but the stuff is widely available, cheap, and easy to set up so I like it.

I would spend the money for a good firewall on each computer (ZoneAlarm is good) and good (and frequently updated) antivirus and anti-spyware software. Alternatively, get a Mac.

(Written from a Mac . . .)