I want to add a new skin and new behaviors to mediawiki:
Creating a new skin + logo (according to samples)
includes creating logo (very simple one) to fit in its color and size with the new skin design.
homepage (it can be done via skin or via wikitext or ...)
Contact us form (there is an existing extension for it)
Adding an additional page to the process of inserting new article
Implementing Find As You Type
Adding To an Article a form to insert redirects to that Article and manage them.