Well, if you want open hardware, buy an Apple II (that machine was coming with the electric schematics). I am not very surprised, and on other hand 33 MHz wait mode, if feasible, seems me almost so good as interruptable sleep mode. Can we speak mAmps here? Specs anyone?
It is unclear if it is possible to switch off the power of some RAM and let the machine running on cachable RAM only. If it were, people asking for longer modes could rely on the CF trick, as Scotty suggested (but I also could to insert a bigger extra battery in the CF slot

)
Now, it is true that a True Suspend was a discussed feature last year during the discussion of the OLPC machine, which in some designs was supossed to have a human energy based e-ink display. It is amusing that iLiad engineers missed that discussion; more likely the machine had already been deployed into production.
Also, it is rare to have a Wacom tablet and to try to be energy-savvy at the same time.