I am currently working on a new project web site which will list professionals in a niche market for them to advertise. Think along the lines of yellow pages, but the web site is completely tailored to a niche market.

My question is how google and other search engines will be able to see our listings. Since the listing will be search based. A user will come to the site and enter in their zip code to find the professionals that service their area. How will google ever see those listing? Or is it even a concern?

Obviously the site will have more than just the listings. Since it is a niche market the plan is to have blogs, forums, ecommerce, and as many things pertaining to the niche as possible. I am developing ways for the professionals to use the blogs as extended marketing to showcase their expertise, which will link to their company specific information page and their web site. So any professional who takes active part in the web site will obviously reap the benefits of this.

So back to the main issue though. Does google follow the urls in the action parameter of a form? If so would it be wise to have a drill down page that the search engines could spider based on that to find all the pages on our site. Since the content for listings and company information pages are dynamically created from data created by the professional, with search engine friendly urls (no query parameters) I am hoping to capitalize as much as possible on those pages.

I am stumped as to what might be the best practice here for this situation. I have been fairly successful in the last year creating a website that places #1 in natural google results for 5 of 6 keyword phrases we target (the 6th flipping between low page 1 and high page 2 from week to week, in a highly competetive keyword phrase). So I'm not 100% foriegn to what it takes to get good results from google. But I am a little foggy about what to do in this situation.

I have valued the advise on these forums for about a year now also and hope someone can give me a little insight. Thanks in advance to everyone here!