With Google maps, you can toggle between a map view and a satellite image view. To view satellite images of MLB parks, click the links below, then click on the satellite link in the upper right corner.

A couple of pictures (Milwaukee, Cincinnati) are only low resolution images. A couple (Philadelphia, San Diego) show the ballpark under construction. The Marlins' home looks like it's configured for a bowl game, while Anaheim seems to be set up for some kind of dirt bike race or something.

AL West
McAfee Coliseum
Angels Stadium
Safeco Field
Ameriquest Field

AL Central
Jacobs Field
Kauffman Stadium
Comerica Park
Metrodome
US Cellular Field

AL East
Rogers Centre
Tropicana Field
Oriole Park
Fenway Park
Yankee Stadium

NL West
Bank One Ballpark
Coors Field
Dodger Stadium
SBC Park
Petco Park

NL Central
Minute Maid Park
Miller Park
Busch Stadium
Wrigley Field
PNC Park
Great American Ballpark

NL East
Turner Field
Dolphins Stadium
Shea Stadium
RFK Stadium
Citizens Bank Park