As of late, I've discovered a program many people use as a relatively simplistic way of writing music for guitars, called Guitar Pro 5.  As the Tech student I am (and the pirate I've become), I used bitlord to download the full program, and so far, I can honestly say I'm impressed.  I'm like my niece in the toy section of Target.  While there are probably more professional programs for this sort of thing, Guitar Pro should provide a large consumer of my time.  I'm really ready to implement my ideas on time signatures and key signatures in actual musical setting.  Also, being not so proficient at all things guitar, I can hear those ideas before I know how to play them.  Should be a lot of fun...