Guitar Tracks is a nice low-cost solution if all you have is a guitar and a PC and would rather not invest in any other equipment. It`s a lot like Cakewalk standard edition with extras. It has an "amp simulator" and it allows you to apply popular guitar effects (chorus, delay, distortion, etc..), but it`s very basic in this area and the end result is at best useful only for demos. It also has kind of a virtual drum machine and comes with a library of drum loops that you can past togeather.
I think Guitar Tracks is a really cool thing for someone who doesn`t have a lot of money to spend, but if you want to create anything professional enough to put up on say
www.mp3.com , you may want to invest in a few other peaces of equipment. At the very least a quality amp modeler/effects unit that has a compressor and noise gate built in (Behringer V-Amp 2, Line6 POD2, DigiTech RP100), and maybe a 4 channel mixer with stereo lineout to run into your sound card.
For my home studio I use Cakewalk Pro, I run a singal in from the line out on my Tascam four track (which I use primarly as a mixer), Into the Tascam I run: ->my guitar (though a Behringer V-Amp 2 for my amp simulation/modeling/effects) ->ZOOM MRT-3 Drum machine which also ->bass in (sometimes direct, sometime though a DigiTech BP200) ->mic (though a BOSS DD-3 Digital Delay unit)
The sound I get with this set up is pretty unbelieveable for the price (< $1000 for everything excluding the PC hardware and Cakewalk Pro).