Al,
I used full songs, and for a very good reason. The logic behind using full songs as opposed to snips was maybe the person with the CD would play it for their enjoyment, say while at home at a party, or while riding along in their car--hopefully in the company of others while the music is playing. This has happened, and it has resulted in obtaining a few jobs that I probably would not have been able to get. If you just have snippets of songs, it's unlikely that the CD will be used other than by the person you sent it to initially. Kinda' like spreading the word through your clients via a CD.
Good Luck,
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)