I see a market for 2 books. One would be a “this is the webMethods platform” for noobs and those just wanting to learn about the basics of the product. Basically, the conceptual equivalent of what the wM docs provide but in someone else’s words (and available without signing up for Advantage–just plunk down your cash) and with some basic samples. These are the components. This is what each of them do. Welcome to XML. Here’s how to write FLOW. Here’s how to do .dsp’s. Here’s how to do Java services. Here’s how to do a web service connector. Here’s how to do FTP. Why you probably don’t need a custom SOAP processor. Why you shouldn’t schedule System.gc.
A description of transactions and the JDBC adapter. How to get rid of that pesky “cannot locate compiler” error. How partners can post to IS. And so on. Perhaps a handful of tools, such as an add-on to WmPublic stuff. Possibly replacements for some of the PSUtilities stuff that should be reworked (math services, for example).
I see room for another book that gets a bit more advanced. Writing content handlers. Customized TN components. Using the Broker API (and when to do so). A document handling framework to make logging and error handling (somewhat) automatic and consistent across all integrations. How to customize Administrator (might be a moot point now though). Standards processing, like EDI and xCBL and the like. At least a couple of chapters on interacting with SAP (though the interest level on that may have come and gone). This might have tools that use unpublished IS services, though I imagine wM might have issues with that.
I had started down the O’Reilly path, mostly because they provided a good bit of author guidelines and a good description of their process on-line. I’m sure AW has similar stuff.
Dang, now you got me all cranked up about doing this again! Hasn’t someone invented a “brain-print” button yet? 
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