These are some of my favourite guitar/music sites on the net in completely random order, clicking on an external link will open a new browser window:

 Dr Mikes Alternative Dictionary of Guitar Effects http://www.spec.u-net.com/effects.htm
You could just find what you have always wanted!

Paul Reed Smith http://prsguitars.com/
The home of the best guitars I have ever played... Old or New!
Get the PRS screensaver too.

Sounds Great http://www.soundsgreatmusic.com
My local shop; close to Manchester and Stockport UK. Pay them a call!

Yamaha http://www.yamaha.com/
One of the most famous names in music.

Future Publishing http://www.futurenet.com/
Home of the guitar magazines in the UK

Fender http://www.arbitergroup.com/
The suppliers of all things Fender!

Musicians net http://www.futurenet.com/musiciansnet/
Network with the magazine musos...

Guitropolis http://www.guitropolis.com/hotlinks.html
A sort of interactive learn the guitar experience.

Jackson Guitars http://www.jacksonguitars.com/html1998/index2.htm
Great value versatile guitars not just metal machines

Chandlers http://www.chandlerguitars.co.uk/
Suppliers of all the famous names.. UK retailer and mail order.

International Guitar Mags http://www.harmony-central.com/Links/#mags
Guitar mags around the world

Retail Listing http://www.guitarplayer.com/gear/vendors/index.htm
Retailers near you!

Music Sales http://www.musicsales.co.uk/
Retailer

Daddario http://www.daddario.com/
All things strings!

Harmony Central http://www.harmony-central.com/map.html
http://www.harmony-central.com/Guitar/tab.html
Campaign to keep this site open at all costs!
An indispensable resource for the guitarist don't miss it!