I keep forgetting to mention this, so with two days left for voting, I better do it now.
ag_fics had their second Long Challenge recently, ending up with 9 fics. If you have some spare time for Arthur/Gwen, please head over and take a look. They range in length from just under 900 words to over 10k, though more than half fall within 1.5-4k. More fic is always good, right?