Nice, I think I´ve read the x-men crossover 5 or 6 times. Here are a few others you may like.
Hunters and Heroeshttp://archiveofourown.org/series/26114 (http://archiveofourown.org/series/26114) (SPN/Avangers) Understandinghttp://tv.adult-fanfiction.org/story.php?no=600092720 (http://tv.adult-fanfiction.org/story.php?no=600092720) (SPN/Smallville) The Frirst Prime Universehttp://archiveofourown.org/series/45417 (http://archiveofourown.org/series/45417) (SPN/SGC crossover from story 3-5) now 2 old but also good one: I´m So Far From My Homehttp://fanfiction.net/s/6118962 (http://fanfiction.net/s/6118962) (SPN/DA) Dean and Alec Save the Dayhttp://fanfiction.net/s/2691653/1 (http://fanfiction.net/s/2691653/1) (SPN/DA)
no subject
Hunters and Heroes http://archiveofourown.org/series/26114 (http://archiveofourown.org/series/26114) (SPN/Avangers)
Understanding http://tv.adult-fanfiction.org/story.php?no=600092720 (http://tv.adult-fanfiction.org/story.php?no=600092720) (SPN/Smallville)
The Frirst Prime Universe http://archiveofourown.org/series/45417 (http://archiveofourown.org/series/45417) (SPN/SGC crossover from story 3-5)
now 2 old but also good one:
I´m So Far From My Home http://fanfiction.net/s/6118962 (http://fanfiction.net/s/6118962) (SPN/DA)
Dean and Alec Save the Day http://fanfiction.net/s/2691653/1 (http://fanfiction.net/s/2691653/1) (SPN/DA)