If you are planning any type of event & posting the adress on your site...I have a post on my marketing help blog that can show you
How to Put a Live Google Map on your Blog.
Put in the address of your event then place the Google Map Gadget on your blog. That way all your guest can put in their starting address and get driving directions without ever leaving your site.
Easy for you to do & will be easy for guest to use. Might just increase attendance since they are less likely to get lost.
Sheryl Loch