Camera Labs

What are the advantages of four thirds or four thirds micro over DSLR, apart from size of components?

The Lecica and EP Cameras are quite expensive.

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Canon EOS 500D
Lenses: EFS 18-55mm IS, EF 50mm F/1.8 II

FourThirds are DSLRs, only small difference being the slightly smaller sensor. Means body can be a fraction smaller, and the effective reach of lenses is longer if you ignore DoF equivalence. While Olympus recently launched a new high end body, the format is for practical purposes dead and has no future.

MicroFourThirds is the mirrorless version, and the first mirrorless system around. Same sensor size, no mirror. The shorter distance between mount and sensor means for wide(r) angle lenses, the design is a bit easier so lenses can be smaller than SLR equivalent.

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Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.