When you try to save a MOSS 2007 List as a template with "Include Content" check box checked (In order to save the list with the available contents), the following message will be shown...
The list is too large to save as a template. The size of a template cannot exceed 10485760 bytes.
To increase the maximum size of list template you can run the following command:
stsadm -o setproperty -propertyname max-template-document-size -propertyvalue 50000000
from the following location in server : C:\Program Files\Common Files\Microsoft Shared\web server extensions\12\BIN
Seems you can increase up to 500 MB.
After running the command, just press CTRL+F5 to view the results :)