Selling Etiquette & Ideas..

[Perfectlap]

my local PCA has a newsletter called Porscheforus with a classified section.
Also check Excellence Magazine I think they have a classified section as well.
Ebay done correctly can be the best exposure you can get. Most PCA members I know check it regularly and refer cars to non-Porsche owning friends when they see a good example. List it with a firm price for starters and see what happens.
You have a certain amount of time to remove the listing if you get a better offer outside of Ebay. I think most people become of aware of the Porsche on eBay and make a deal with the owner outside of Ebay. A cheap way to get your car noticed.