YongNuo C1:
Canon: EOS 30/33/50/300/300D(Digital Rebel)/350D(Rebel XT)/400D(Rebel XTi)/450D(Rebel XSi)/1000D(Rebel XS)/600D/60D

Contax: N/Contax 645

Pentax: K110D/K100D/K200D/K10D/K20D/ *ist DS/DS2/DS/DL2/DL/D

Samsung: GX-1S/GX-1L/GX-10/GX-20

And CANON RS-60E3 similar

YongNuo C3
Canon: EOS 1V/3/1D/1Ds/1DS Mark II/1Ds Mark III/

1D Mark II/1Ds Mark III 10D/20D/30D/40D/50D/5D/5DMkII/7D

and CANON RS-80N3 similar

YongNuo N1

Nikon: N90s/F5/F6/F100/F90/F90X/D1/D1H/D1X/D2/D3/D2H/D2Hs/D2X/D2Xs D200/D300/D700

KODAK:DSC-14N

FUJI: S3Pro/S5pro

and NIKON MC-30 similar

YongNuo N2

Nikon:D70/ D70s/D80

and CANON RS-80N3 similar

YongNuo N3

Nikon:D90 D600 D5000 D3100 

YongNuo S1

Sony: A100/A200/A300/A350/A700/A900, and RM-S1AM similar

Minolta: Dynax 7D/5D Dynax 9,7,5,4,3 Dynax 807si, 800si, 700si, 600si, 505si Maxxum5D/7D, DIMAGE A1/A2/5/7/7I/7HI

and RC-1000S, RC-1000L similar