Know how to market your bike. It's all about adding value to your bike, whether it's actual or perceived. Flipping the stem, setting the bars straight, new bar tape and a good cleaning can add much more value than new tires. Many people don't realize the costs of tires, so why would they care if it's got new ones?
When you list your bike, make sure you sound knowledgeable about the bike without being too technical. People are less likely to talk you down if you know your stuff. Also, know your target market. Who are you selling to? What are they going to care about? Do they care that your bike is all period correct? No. Realize that the majority of buyers know little to nothing about bicycles.
Take nice pictures. Make sure they are well lit, and of good quality. Don't upload them through craigslist or ebay, instead use a dedicated host site such as photobucket, and embed the photos that way.