Some tasty things from the nearest version...

They are:

-- PEAR (multiple database supporting)
-- WYSIWYG editor for <teaxarea> fields
-- print mode
-- export mode
-- 2 or more datagrids on one page

and etc.

I think it's a really tasty things.... U-u-u-ah!
Date of v.4.0.0 release - 1.03.07!

By the way, you can see here all version comparison (including v 4.x.x).