re: New "Filament" site
This site is almost completely dedicated to filaments: http://gravity.webhostme.com/mars/ and the author was one of the contributors to the mentioned "Problematica" page (... the best "dubio fossil" page yet). This new page, however, has one of the largest catalog of filamentary features that I have seen in the Web.
It has several nice finds and stunning images.
And for those who don't agree with his analysis, ....well,... just look at the images and make your own conclusions!