Well, today I'm writing on discovery for my book. Basically, I'm breaking it up into directory-style discovery using UDDI, and inspection style discovery using WS-Inspection. I'm still trying to wrap my head around all of the use cases for these technologies. Right now, it seems like most people are using DISCO (the precursor to WS-Inspection), but probably unknowingly. I know that adhoc discovery is pretty limited. I also know that UDDI is extremely flexible.

For instance, I would always use UDDI, even within a LAN, for automatic roll-over. How? Well, that's what I'm describing in my book today :-)