three new bits of awesomeness for you all:

Aardict - offline wikipedia dump-reader:
Ubuntu/Mac/Windows/Maemo/Source
http://aarddict.org/

Evopedia - offline wikipedia dump-reader:
http://evopedia.info/
Maemo/Symbian/Ubuntu

Calibre - ebook reader/management:
http://calibre-ebook.com/
Windows/OSX/Linux

Sigil -A WYSIWYG ebook/epub editor:
http://sigildev.blogspot.com/
Windows/OSX/Linux