Я использовал Google Maps пару раз, но что интересноOpenLayers.
Прежде чем приступить к программированию, вот пара вопросов, которые приходят мне в голову,

Why would I use OpenLayers instead of Google Maps? Except for its OSS licence, anyway Did you encounter any situation in which you'd recommend absolutly not using OpenLayers? I did a search about "OpenLayers" on Stack Overflow; there are not many answers. Does it mean this solution is not used much? Could it be a problem for long-term viability of the project? For those of you who have already used OpenLayers: are there any common pitfalls / problems I may encounter? What about using a JavaScript Framework with it? I've seen it's using Prototype, and I know Prototype, so that would be OK. But what about using something else like MooTools? (Which is not compatible with Prototype, BTW) Are there any kind of speed and performance related problems? I need my application to be responsive and can't wait hours to get a map displayed. Are there maps available for many places, or are there lots of those missing? That is, I'm in France, and need my application to work at least for big cities... Will that be OK? if not, is it easy to find layers and visualisations for OpenLayers and integrate them? Is there any kind of API to display roads? For instance, to show roads that are one-way only. If yes, how can I do that? Do I have to have some kind of file containing those roads information, and, then, display them on the map by myself? Do you know any good tutorial to OpenLayers?

Я еще не пробовал, это просто из синих вопросов ...