Yo - I've got some areas that have been timbered and/or had gas wells/roadways installed over the past 2-3 years.

I use aerial photos and satellite imagery as a primary mode of scouting and planning my ingress/egress routes. However, the problem is that the images on Yahoo! BETA (the maps that I use) - are not updated to show the recent changes to the land.

My question is: Are there any aerial photos available (for free) that are updated frequently?

The pictures that I'm looking at are at least 2 years old.