With over 3,000 photos posted, and over 8,000 views of photos, I have to say I really have enjoyed my first year using Flickr. I have the Flickr Pro account, that offers me unlimited monthly photo posting for only $24.95/year. A bargain, I think.
Flickr has served me many ways:
I can take photos of neighborhoods and send them to folks who make inquiries.
A lady called me from out of town and asked me to check on real estate she owned, without ever having seen it. 60+ photos later, she had seen it, and felt a lot better.
Flickr lets me post photos, and easily link to them in emails and blog posts.
When I do a Cary, NC, neighborhood profile blog, I can link to the Flickr photo slideshow for that blog, and visitors can see all the photos I have taken in the area. I can do the same thing for listings, offering photo sets for the home, far above the limits of the MLS and Realtor.com.