I read the Last Herald Mage series. I found it lying around in the living room at some Buttsfrag or other, read the blurb, looked at the cover... and ordered it from Amazon as soon as I got home. I have never read a book that reads more like fanfic. Pretty men galore. Slash. Angst and injury left, right, and centre. I didn't think they were very good... but I loved them anyway.

I've not read the Diane Duane series, but will look out for it. I'll also put the others that you recommend on my "to read" list. Once I've read their Amazon write-ups, checked which (if any) the library stocks, I might well ask if I can borrow a few of them at Wightfrag.