I have been addicted to the Kakuro portion of this site for a long time, and I miss it too. It seems it had been down for at least two weeks.
Then, the other day, after several consecutive days of failure, I tried it again. Voila! It finally worked. So I was able to retrieve my Kakuro puzzles for the previous 10 days.
But just now, it failed again.
However, for the moment at least, the direct link seems to work. Try
http://www.sudoku.org.uk/kakuroflash/kakuro.html. Lots of luck!
EDIT: But I can't add it to my Favorites in IE. It seems to destroy itself whenever I try. I guess I'll just have to come back to this post, every day, and click on the above.
Bill Smythe