Nissin have just brought out the i40 Love Mini flash. (DPReview) Its not available here in m4/3 yet, but, being much smaller than the other flashes, it could be the ideal companion for m4/3. Finally something the right size! All others are clumpers!
It has Slave, TTL, swivel/zoom, diffusor, video light. HSS.
So everything the Metz 44 AF-1 has. Although at 189€ much more expensive at the moment.
Compare sizes WxDxH:

Subscribe to see EXIF info for this image (if available)
It has Slave, TTL, swivel/zoom, diffusor, video light. HSS.
So everything the Metz 44 AF-1 has. Although at 189€ much more expensive at the moment.
Compare sizes WxDxH:
- Nissin i40 ----------: 61 x _85 x _85 (203g) --- GN27 --- 189€
- Oly FL 600 ---------: 62 x _98 x 104 (255g) --- GN36 --- 299€
- Nissin Di466 -------: 67 x _95 x 105 (230g) --- GN22 --- _74€
- Yongnuo YN560 III-: 60 x ___ x ___ (350g) --- GN39 --- _64€
- Metz 44 AF-1-------: 73 x 106 x 130 (306g) --- GN27 --- 132€