thanks to:

Haggis from hackerslab's forums
Aleph One (from 'smashing the stack for fun and profit' [p55-08])
Pierre-Alain Fayolle & Vincent Glaume (for good article about buffer overflows 'A Buffer Overflow Study Attacks & Defenses')
Matt Conover (a.k.a. Shok) & w00w00 Security Team (from article about heap overflows)
klog (from article about frame pointer overwriting [p55-08])
Christophe Blaess, Christophe Grenier & Frédéric Raynal (for article about race conditioning)
droogie for lvl14.c (droogie powertech no) [i just couldn't figure this one out myself]
ykoz for mailing me the password for levelx (yko69 virgilio it) [my spoofed packets didn't end up in korea]