I'm fitting laminate flooring in a hallway with numerous doors.

Around the skirting board edges I can put in cork expansion strips
and cover with beading. However, the doorways are recessed and I'm
not sure how best to handle those. Here's a photo to illustrate:

http://homepage.ntlworld.com/joe.tully/doorway.jpg

It's quite a large gap and I'm not sure how best to fill it in so
that it doesn't look conspicuous.

I would guess that leaving exposed cork is not a good idea, as it will
wear quickly.