Any idea how you can safely use ONE computer for BOTH work and internet?

I'm planning to set up a small music project studio, built around a powerbook, that I will be sharing with a friend of mine. My friend is going to use the computer for music AND heavy internet use, but I will only use it for music work (off-line).
The thing is then that I am slightly worried about viruses, worms, spyware and similar unwanted stuff 'sneaking in' when the laptop is online. Even with firewall and anti-virus I guess there is always a risk.
Any idea if there is a way of keeping things completely separate?
How about if I had a bootable external hard drive for my work, with the Mac OS system on. Then when I'm working I could boot up from that drive (and use the computer off-line).
Maybe we could even remove the internal hard drive from the powerbook (?), and use the powerbook with two external hard drives instead: One bootable drive for me and another bootable drive for my studio partner (and then only connect one hard drive at the time).
Any idea if this would work well..? (I'm not sure if i.e. a virus could sneak in anyway, through the PRAM, L2 cache or the RAM or something similar) Or does anyone have any other suggestions...? Any ideas much appreciated. Thanks!

Not too much worry with Macs, but get an Ethernet Router, skip Wireless, use strong Passwords.
How about if I had a bootable external hard drive for my work, with the Mac OS system on. Then when I'm working I could boot up from that drive (and use the computer off-line).
Excellent idea, especially if the heavy Net user doesn't have Admin rights.
One bootable drive for me and another bootable drive for my studio partner (and then only connect one hard drive at the time).
Just about foolproof! Just need 2 more drives for backup. Not sure why you'd want to remove the internal HD though.
No Viruses yet in OSX land, in fact the only Malware I know about requires you to install it for itself!
You'll be OK, that separate drives idea is pure genius.:-)
Most don't need it on Macs, but here ya go on the Mac side...
ClamXAV, free Virus scanner...
http://www.clamxav.com/
Little Snitch, stops/alerts outgoing stuff...
http://www.obdev.at/products/littlesnitch/index.html
HenWen/Snort combo, that is a free MAJOR Firewall...
http://seiryu.home.comcast.net/henwen.html
Then the venerable old Brickhoues/Flying Buttress Firewall...
http://personalpages.tds.net/~brian_hill/downloads.html
WaterRoof is a firewall management frontend with bandwidth tuning, NAT setup, port redirection, dynamic rules tracking, predefined rule sets, wizard, logs, statistics and other features.
http://www.macupdate.com/info.php/id/23317
Monitor net usage...
http://mac.softpedia.com/get/Dashboard-Widgets/Information/Videotron-Internet-Us age-Monitor.shtml

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