Maybe this is old news, but nevertheless - http://visibleearth.nasa.gov/view_set.php?categoryID=2355
Enjoy.
I have that somewhere from a long while back.
But this is the 'next generation' with seasonal changes, every month another 10Mb 21600x21600 jpg. If you really want to recreate earth in a specific season, this is a really great resource.
The "next generation" imagery has actually been around for a little while, but it is really good. The 21600x21600 image is actually 1 of 8 sub images. The largest size that you can download is 2GB compressed and 86400x43200. That would take a long time to download. The smaller ones are great though.
Also there is a plugin for google earth that lets you view the different images
And when we at last have TG2 64 bit, we can load those 2GB files and render with them. ;)
- Oshyan
Cool. Good to know this could be useful.