GSMArena has put together a complete list of the devices manufactured by HTC since 2002. The table lists the HTC model as well as their respective model names as sold by different companies, including Qtek, i-Mate, Dopod and Orange. In fact, there are two tables, one for Pocket PC phones and one for Smartphones.
Hopefully, GSMArena will continue to update this table, even if a number of these vendors have stopped selling HTC products now that the company is doing so itself (by adding a new HTC column to track final model names).
Source: Pocket PC Mauritius