Speaking of links....send those along, too!
(Spike/Xander...hmmm)
OK..You asked for it, bud!
The Internet home for Giles/Xander, my personal favorite, is here:
http://www.seeking-solace.com/NoOneKnows-GX/ToBeLoved.htmThere's really nothing there that I don't love in some way or another, but my favorite authors are probably antennapedia, Soft Princess, Mireille, and Dr. Squidlove, in no particular order.
Now for Spike/Xander, there are two excellent spots. One is Bloodclaim (
http://community.livejournal.com/bloodclaim/2725575.html). That link is for the member recommendation's page. You may have to join the livejournal community bloodclaim to get to it.
The second Internet home for high quality Spike/Xander is The Spander Files (
http://spanderfiles.com/contents.html). Stories are categorized by what your interests are. It's hard to pick favorites there, but at the risk of revealing some personal kink, check out this section: http://spanderfiles.com/grp/daddy.html
Happy reading!