A site that I did a while back just got published in ESRI's ArcNews print magazine. ArcNews is a quarterly magazine dedicated to showcasing ESRI's GIS technology, software, user case studies, etc. They never give you a heads up when they publish these sites...so its always a nice surprise to see one get published. I developed the site with Coldfusion 7, but its now running on 8. I wish 8 was around when I did this one...I can think of a bunch of stuff I would have done differently.
The North Carolina Alternative Fuel Stations Map helps people in North Carolina locate stations offering alternative fuels, such as hydrogen, biodiesel, and ethanol. Visitors to the site can request information based on fuel type, proximity to an interstate highway, ZIP Code, and more.
Anyway, the site itself is a ArcIMS / ArcWEB services hybrid site. I use ArcWeb for much of the basemap data, and perform the spatial searches & locally using ArcIMS. I dont actually merge the images, but rather I create my ArcIMS images with a transparency and overlay them on the ArcWeb images. Also of note, ArcWeb services has released a Flex api, which looks pretty cool, which you can check out here. I plan to dig a bit deeper into that soon.