Here's it's Melabs PicBasic Forum, so why you didn't found many 100% assembler code.

MPLAB is a code editor and can support various PIC Programming language, such as Melabs PICBasic, and other Basic, C variants.

But yes you can use MPLAB and develop everything in assembler as well. Bellow, few links for assembler code
www.winpicprog.co.uk
www.piclist.com
http://www.microchip.com/stellent/id...lter1=function

and microchip forum? why not?
http://forum.microchip.com/

HTH