Have you tried seraching for "EDL Export" within this forum?
I think you will find there are various solutions out there (ranging from using the Save-As feature to create a non-standard EDL) to using a script (provided on the Sony Vegas Scripts area) that will export a standardized EDL.
If you search the forums you will find more details on EDL's and VV. You can export a VV EDL which doesn't do much overall. There is a script that does a really basic VV EDL conversion to a cuts only CMX based EDL but there are many restrictions to that.