Welcome to MR, LadyWriter. How nice to know that you were told about our forums.
I just went to get the link to "free" Kindle books from the Kindle forum and saw that you have already found it.
The below links have information that may help in understanding your Kindle.
Links Every Kindle Owner Should Have
From the MR Wiki...
Kindle 2 US, Int'l and Kindle DX Font Hack
Kindle 2 US, Int'l and Kindle DX Screen Saver Hack
Kindle Myths and Partial Truths
Amazon Kindle DX
E-book formats
You can even explore using
Calibre and Kovid, the creator, frequents the forums here. We even have a dedicated
Calibre forum.
Did you know that MR has free ebooks? They have been beautifully handcrafted by some very dedicated MR members.
For your Kindle..
Mobi / prc format ebooks
Download the MobiGuide and get your books via Whispernet..(up on the top left in the blue bar.. click on ebooks.. then in the drop down menu choose Mobipocket download guide)
Free ebook sites
feedbooks.com This site also has a Kindle Guide to download and you can get their books via Whispernet - there is a video on how to use the guide.
manybooks.net
Free and for purchase ebooks
smashwords.com
baen.com
Plus Baen has a
great free library
Have fun exploring the forums and ask if you have any questions.