Missing from your list that I liked was Orange Assistant (or was it Orange Messenger, can't remember!) where an agent took a message for you and sent it as a text. 24 hour customer service was useful too.
Weren't Orange also the first to introduce - and then remove! - per second billing?
Line 2 is available again - Called Personal Line - missed it for years, but have recently had it added on a BlackBerry :-) FOC charge too if you only want it for inbound calls.
I'm pretty sure they're trying to get EveryPhone off the ground again as well, despite saying for years it was no longer a supported service.