I think reflective tape is well worth it if you're ever going to be riding at dawn, dusk or night. Check Amazon for "Conspicuity Tape". There are also 3M tapes that come in other colors, even black, that are highly reflective.
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"I had a great ride this morning, except for that part about winding up at work."
Bikes so far: 2011 Felt Z85,
80's Raleigh Sovereign (USA),
91 Bianchi Peregrine,
91 Austro-Daimler Pathfinder,
90's Trek 730 Multitrack, STOLEN:
80 Schwinn Voyageur (Japan)