I've always used a distinctive striped towel to lay down in my transition area.  The towel keeps my gear clean and dry and also helps me locate my area.  I've noticed that few other triathletes use distinctive towels to help them locate their transition area and I've often wondered how many per race forget were they parked their bike, etc. 

TriTowels.com is a new company that has 5 different 60" x 35" terry cloth towels at a reasonable price that are perfect for adding distinction to your transition area.  What I like most about them though is that my wife no longer gets mad at me for using one of "her" towels.  See designs pictured on the right. 

TriTowels also has a smaller 42" x 24" towel for only $14.95 (see last towel pictured).  You can purchase tri towels directly via its web site.

KDG