Forum .LRN Q&A: Changes between dotLRN 1.0 and 1.0.1
I'm not sure what the exact changes are (probably just bug fixes) but please note that if you're going to use dotLRN in Spanish (I read your other post), you cannot do that with dotLRN 1.0.x. You need to get both OpenACS and dotLRN from cvs head, which might or might not be stable at the moment.
Using CVS is the way to get the latest i18n version.
There are two CVS documents that might help you here:
(I recently added Andrew's CVS document)