Other mashups... well, the DJ calls them Hybrids, because they are mixed live and don't involve all the work that a mashup does.
I found these a while back, forgot to post.
Covenant Hybrids
Futureluminal (Covenant + Villanord) v.0
Covenant's "Luminal" mixed live over Villanord's "Futurescope"
:04m :14s // 128kbps // 3.9MB — february.2004
Like Tears (Covenant + Soman) v.1
Covenant's "Like Tears in Rain" mixed lived over Soman's "Tears (Instrumental Version)"
:04m :14s // 192kbps // 5.9MB — april.2005
Panhead II (Covenant + Soman) v.1
Covenant's "Figurehead" mixed live over Soman's "Pan Tau I"
:04m :23s // 192kbps // 6.1MB — june.2004
Panhead I (Covenant + Soman) v.1
Covenant's "Figurehead" mixed live over Soman's "Pan Tau II"
:06m :27s // 192kbps // 8.9MB — june.2004
There are some DM ones too, and lots of others.
My favorite was DJ Fross mixing One World One Sky with Bonnie Taylor, Holding Out for a Hero.