MBAM = MalwareBytes Anti-Malware
It's a freeware on-demand AV scanner that specializes in disinfection rather than prevention.
TDSSKiller = Kaspersky TDSSKiller (TDSS is a family of rootkits and Kaspersky's product kills them)
This is a freeware tool provided by Kaspersky that targets a specific family of rootkits that are now common among malware today in which MBAM cannot detect very well.
[Edited by Neo7, 8/19/2012 4:36:11 PM]