Although fall is upon us, entries for 2010 races are now becoming available. One of the first ones is Paris which is on 11/April?10. Although not as fast as Berlin or Amsterdam, Paris is a fantastic marathon especially since it is local. Furthermore, despite being in France, it is well organized with lots of water stations, etc. and there is usually pretty good crowd support as well. For those not trying for a PB or break three hours, there is even a wine station in the Bois.
If you are thinking about doing it, I would strongly suggest entering now as it will fill up when the London marathon rejections are announced in November. (London is a week later and the entries are by lottery.)
The url is http://www.parismarathon.com/