Yes, don't give up.
Keep asking neighbors and putting up flyers. Call any local vet offices for reports of a "found" cat, fax or bring them a flyer and ask them to post it. Other pet lovers tend to be helpful and proactive in getting lost pets back home.
Post a "found" notice on Craigslist, but give only general info, to keep from being scammed. Then ask those who respond for a detail they would only know about if they actually have your cat (such as, she has a black spot on her belly, broken tooth, etc.). Many local newspapers offer free "found" classified ads too.
About microchipping: great idea; just remember to register your contact information with the company's database. Nothing is so frustrating as scanning a found pet, finding a chip, calling the company, and finding that there is no way to get in touch with the owner. Also be sure when you move or change phone numbers, to update with them.