A daily killer sudoku with a 30day archive are 0n http://www.sudokuwiki.org/Daily_Killer_Sudoku.asp
Layout of the puzzles are the same as on http://www.sudoku.org.uk/
On this site you find also a daily sudoku
sudoku - kakuro - hitori - hashi - slitherlink - battleship - pic-a-pix - link-a-pix - fill-a-pix - maze-a-pix - dot-a-pix - tents - centriko - hexa-trex - squaro - futoshiki - trigon - trizm - kenken - kendoku .................