I checked my comic book collection yesterday and some of the better crossovers in comics.

Here's my list:

Deathmate Black
Marvel Vs. DC - PRE Amalgam
Xcutioner's Song
AOA (The original run)

My picks:

Intercompany Crossovers:

X-Men/Teen Titans (Walt Simonson Art)
JLA/Avengers
Batman/Hellboy/Starman
Batman/the Spirit

Major Comic Events:

UNITY from Valiant Comics (I wonder how many people actually remember this one...)

Hands down JLA / Avengers by George Perez

I had pictures of Superman vs Superspidey but yeah... it JLA/AVENGERS that really tops the list.

Another interesting crossover was Spiderman and Batman by Mark Bagley. Their opponents were quite an interesting tandem also, Carnage and Joker. Im just a happy fan of classic Mark Bagley Spiderman (obviously from my signature)

Spider-man and Batman by Mark Bagley

Here is the actual comic cover (classic embossed type cover)


A picture of Carnage and Joker in one page