Google, MSN, and others do not go out too far past the coastline since there is not a whole lot out there to see, other than water. The new Google 5.0 just has bottom contours, and some other features related to the ocean, but no images in high detail.
You can download some pretty interesting images from different satelites on the USGS web site. It is a little harder to sort through what you are looking for, but certainly worth the time if you have a specific target or area in mind.
As for LimoBobs images, I am not sure where he got them or what type of images they are! Maybe LimoBob will share what he finds.
Good Luck,
Robert