Update on the HTC P4350, headphone adapters, and changing the browser language.
[Update] I tried the "UME to 3.5mm" connector for Motorola Mp3 phones, and it does not work with HTC devices!
[Update 2] HTC Europe is taking pre-orders on an adapter (the snappily-named "HTC P4350 Y Cable - 11pin to 5pin +3.5mm", though I prefer "Item 145068") out of the UK for £10, or about $25CAD. Plus £23 to ship to Canada! Foiled. There's also a pretty cool (wired) remote control that has the headphone jack plus a lot more, it starts at £25 plus the £23 shipping for a not-worth-it grand total of about $75 CAD. Foiled again.
[Update 3] The web browser was submitting French as my preferred language, even after updating Regional Settings to en-US. That gets annoying on sites developed by people who know what they're doing. The IE Mobile Team helpfully let me know the real place to make the change is the registry: Look up HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International and see if there is a value called “AcceptLanguage”. You can either update that value or delete it and it should default to en-US and fix the issue. Thanks! I use the excellent Total Commander for WM5 to edit the registry.
[Update 4] Um, AcceptLanguage already doesn't exist on this device. As it turns out, the sites I visited in Paris must have set my language by incoming IP address, as I can't reproduce it now that I'm back on Canadian soil. No brain, no headache!