The Four Thirds system has grown by leaps and bounds over the last few years, this chart below is a guide to product reviews at the site, as well as where to buy gear. Use the filter below to quickly sort down the products to what you are looking for. (please note - 4/3 stands for four thirds gear, and µ4/3 represents Micro Four thirds. CDAF equals -"High-Speed Imager AF" Compatible, SWD - Super sonic wave drive)
                   
µ4/3 Olympus E-P1 12MP   Camera   Preview - B&H  :  Amazon
4/3 Olympus E-3 10MP   Camera v1.302-09 1.4 04-09 Preview - Review - B&H  :  Amazon
4/3 Olympus E-420 10MP   Camera

v1.1 09-08

 Preview - B&H  :  Amazon
4/3 Olympus E-520 10MP   Camera v1.1 09-08 Preview - B&H  :  Amazon
µ4/3 Panasonic DMC-G1 12MP   Camera   Preview - Q&A - Review B&H  :  Amazon
4/3 Olympus E-30 12MP   Camera v1.1 04-09 Preview - Review - B&H  :  Amazon
4/3 Olympus E-620 12MP   Camera   Preview - B&H  :  Amazon
µ4/3 Panasonic DMC-GH1 12MP   Camera   Preview - B&H  :  Amazon
4/3 Olympus 9-18mm -Standard Grade     Lens

v1.1 03-09

   B&H  :  Amazon
4/3 Olympus 25mm "Pancake" - Standard Grade   CDAF compatible Lens v1.2 10-08 Preview B&H  :  Amazon
4/3 Olympus 35mm Macro f3.5 - Standard Grade Macro   Lens v1.2 10-08   B&H  :  Amazon
4/3 Olympus 14-42mm f3.5-5.6 - Standard Grade   CDAF compatible Lens v1.3 10-08   B&H  :  Amazon
4/3 Olympus 40-150mm f4-5.6 - Standard Grade   CDAF compatible Lens v1.3 10-08   B&H  :  Amazon
4/3 Olympus 70-300mm f4-5.6 - Standard Grade Macro CDAF compatible Lens v1.3 05-09   B&H  :  Amazon
4/3 Olympus 18-180mm f3.5-6.3 - Standard Grade     Lens v1.2 05-09   B&H  :  Amazon
4/3 Olympus 8mm f3.5 - High Grade Fisheye   Lens v1.1 05-09   B&H  :  Amazon
4/3 Olympus 11-22mm f2.8-3.5 - High Grade     Lens     B&H  :  Amazon
4/3 Olympus 14-54mm f2.8-35 - High Grade discontinued   Lens v1.1 01-04   B&H  :  Amazon
4/3 Olympus 14-54mm f2.8-35 II - High Grade   CDAF compatible Lens v1.1 02-09   B&H  :
4/3 Olympus 12-60mm f2.8-4 - High Grade SWD   Lens v1.1 01-08 General info B&H  :  Amazon
4/3 Olympus 50mm f2.0 - High Grade Macro   Lens     B&H  :  Amazon
4/3 Olympus 50-200mm f2.8-3.5 - High Grade SWD   Lens   General info B&H  :  Amazon
4/3 Olympus 7-14mm - Super High Grade     Lens     B&H  :  Amazon
4/3 Olympus 14-35mm - Super High Grade SWD   Lens     B&H  :  Amazon
4/3 Olympus 35-100mm - Super High Grade     Lens v1.2 10-08   B&H  :  Amazon
4/3 Olympus 90-250mm - Super High Grade     Lens v1.2 05-09   B&H  :  Amazon
4/3 Olympus 150mm - Super High Grade     Lens     B&H  :  Amazon
4/3 Olympus 300mm - Super High Grade     Lens     B&H  :  Amazon
4/3 Panasonic 14-50mm f2.8-3.5 Mega O.I.S.   Lens     B&H  : 
4/3 Panasonic 14-150mm f3.5-5.6 Mega O.I.S.   Lens     B&H  : 
4/3 Panasonic 25mm f1.4   CDAF compatible Lens v2.1 10-08   B&H  : 
4/3 Sigma 18-50mm f2.8 Macro   Lens     B&H  : 
4/3 Sigma 18-50mm f3.5-5.6     Lens     B&H  :  Amazon
4/3 Sigma 300-800mm f5.6     Lens     B&H  : 
4/3 Sigma 50-500mm f4-5.6     Lens     B&H  :  Amazon
4/3 Sigma 55-200mm f4-5.6     Lens     B&H  :  Amazon
4/3 Sigma 135-400mm f4.5-5.6     Lens     B&H  :  Amazon
4/3 Sigma 105mm f2.8 Macro   Lens     B&H  :  Amazon
4/3 Sigma 150mm f2.8 Macro   Lens     B&H  :  Amazon
4/3 Sigma 24mm f1.8 Macro   Lens     B&H  :  Amazon
4/3 Sigma 30mm f1.4     Lens     B&H  :  Amazon
4/3 Sigma 70-200mm f2.8     Lens     B&H  :  Amazon
4/3 Panasonic 14-50mm f3.8-5.6 Mega O.I.S.   Lens     B&H  : 
µ4/3 Panasonic 45-200mm f4-5.6 Mega O.I.S. CDAF compatible Lens     B&H  :  Amazon
4/3 Sigma 10-20mm f4-5.6     Lens     B&H  :  Amazon
4/3 Sigma 50mm F1.4 EX DG HSM   Lens v1.1 03-09   B&H  :
4/3 Olympus EC-20     Lens Acc. v1.1 12-07 General info - Comparison - Comparision w/ 150mm - B&H  :  Amazon
4/3 Olympus EC-1.4     Lens Acc. v1.1 12-04 Comparison - B&H  :  Amazon
4/3 Olympus EX-25     Lens Acc. v1.1 12-04   B&H  :  Amazon