A short while ago word came down that there would not be a fix for those running Vista X64 machines for the missing Send to OneNote functionality until the next release of OneNote. Daniel Escapa of the OneNote team has posted a workaround that he uses that sort of kinda offers some help in the matter.
Essentially you install a converter program to output image files when you choose to “Print” and use this method to print a TIFF file into OneNote. The downside? The TIFF file isn’t OCR’d so if there is text invovled it won’t be searchable.
I’ll have to give this a try on the HP tx2051.
More details on Dan’s OneNote Blog