Oven: Awesome! You have made it a certainty that the rest of my day will be wasted. Thank you.

Two brief addendums (addenda?):

a) I turned your mention of Quirkle.com in your post into a link, because I don't want our seven or eight readers working too hard by having to copy the text into their address box.

b) I would like to waste my entire day on this puzzle, but can't unless I find a site with a Java applet that simulates it. Thank Heavens! Here is one.Time to tell my secretary to cancel all my patients.
 

Oven: You are killing me. i've spent the last 30 minutes sliding blocks around and just got the big block into the lower right corner (on move 36). D'oh!
 

What can I say? It's a good, hard puzzle. If I can do it then you can do it. I think your problem is that work is interfering with your play. You need to focus.
 

Dag nab it! It's really infuriating. I'm going to have to get back to it tomorrow after I actually do some things that contribute to the feeding and education of my children. Oven: did you actually buy this implement of torture? (I'm actually thinking about it. It would be a fun Shabbat toy when we don't play with any electronics.) If not, did you use a Java applet, or what?
 

I did not purchase it, but I might just because I enjoyed it so much.

I created and manipulated the pieces in Visio. Every six moves or so I took a snapshot before moving on. This allowed me to see the overall trend of my moves and go back to important crossroads when I hit a dead end.
 

Whewf! Finally did it. I can now die in peace. I may need to purchase it just to annoy my guests and ensure that fewer people visit.

Oven: Here's a site dedicated to sliding block puzzles. It's the site that had the Quzzle applet I linked to above. I'm not going to look at it, but I hope you do and that you don't sleep for the next two days.