Curve Doku

You can find this nice sudoku variation on http://www.thegriddle.net
There are also other sudoku variations like shape sudoku, multi sudoku,
stretch sum sudoku, funky kakuro, quad clue sodoku, ....

hyper, even/odd, samurai....

On http://www.sudoku-space.com/ you can play sudoku's, sudoku-x's, stairstep sudoku's

hyper sudoku's and win sudoku's online.

There are daily pdf-files to print (also a daily pdf file with 3 samurai sudoku's)

Clueless puzzles

There are no new clueless puzzles on sudocue.net
But now you find these puzzles on http://www.rcbroughton.co.uk/sudoku/forum/index.php
Every week you find a new puzzle in different difficulty's (novice ---> chief wizard)

Kendoku

Kendoku is a combination of KenKen and Sudoku

On the sudexel forum you find this variation

'Kenduko Ninjo Links'

http://sudexel.com/forum/

You have to register to get access to the puzzles

KenKen

On timesonline you can find this 'new' logic puzzle

http://entertainment.timesonline.co.uk/tol/sitesearch.do?sortBy=relevancy&offset=0&query=kenken&hitsperpage=25&nextOffset=0&sectionId=1022

KrazyDad's Slitherlinks

On http://www.krazydad.com/puzzles.php you find sudoku's , kakuro's, Jigoku's, Kidoku's, Mazes and Slitherlinks
You also find nice slitherlink-variations on this site: Penrose , Altair, Laves and Snowflake

Conceptis launched new website

Check out the complete new website of Conceptis

http://www.conceptispuzzles.com