Richard,
Can't tell you much about the salmon, I'm afraid, other than try the lower beats, below Penrith. Lazonby estates have two excellent beats available on pre-booked day tickets. I'll try and dig out the phone nr for you (also excellent trout and grayling water, incidentally).
Forecast hereabouts is for a dry week into next weekend. The river is currently at summer level and clear, but we are in the cream of the season at the moment. If you make the journey over the next week or so, I should think it won't be a wasted one.
I'll keep you informed - hopefully I'll be able to get out a bit more over the next few weeks.
Incidentally, you might try looking at the regular reports posted on KSAA's website:
http://www.blog.kirkbystephen.net/eden/
This is an excellent site run by a club on the upper reaches - available on a day ticket from the village general store and excellent fishing if there is a bit of fresh water coming through.
Tight lines,
Matt