Yes - loads!
I can personally vouch that Kontakt2 works with F2k6 very well on my system - and you can mix different NI players in the same score.
Software = Finale 2006 (previous versions back to 2000 not currently installed) ~ Garritan GPO ~ Sonar 4 Producer ~ Kontakt 2 ~ WinXP Home SP1Hardware = Athlon XP 2200 ~ 1.5 Gb RAM ~ Audigy Sound Card
Real Instruments = Bach Strad LT16MG, LT36G, 42B + B&H Sovereign Studio Tenor Trombones ~ Holton 181 Bass Trombone ~ Getzen Bass Trumpet ~ B&H Euphonium ~ M-Audio Keystation 88ES MIDI keyboard ~ Roland SoundCanvas SC-33
Leisure stuff = ST:TNG ~ Kronenbourg ~ Italian Red Wine ~ Curry
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