Karel has also asked me to mention that there is going to be another Sudoku Cup this weekend - more details here: http://sudokucup.com/content/practice-puzzles. And whilst you're there, you'll doubtlessly want to play Daily League puzzles online.
EDIT: please note an earlier version of the puzzle had the wrong length of thermometers in Row 1. Sorry!
#264 Thermo Sudoku – rated mediumAll puzzles © Tom Collyer 2009-13.