Easy to make editable maps

I have a client who provides reps to her clients, almost like an employment agency. It was getting to the point she couldnt keep up who was where. She called and asked if I could map out, where her clients were located in a general area, and where the reps were located, in reference to these clients. I found a fun site called mapbuilder. Map builder is a mashup map creator. In other words, you can add your locations with different colored icons and save it for future reference. You give client 'A' locations a blue icon, client 'B' locations a red icon... and so on, they have made it that simple. They also have a link called booming maps, which gives you all the maps that have been created with the highest hits.. Do you want to map out your route for garage sales this weekend? you can do it here. Real Estate agents find this tool priceless. They can map out every home they have for sale, print it out and hand to buyers. It will also give you the HTML if you want to share the map on your website. The only down side I found is it does take time to enter all the addresses. That is why my client called me to do it. I spent the time on her map, while she worked on her business.