8045 Telescopic handler
Price: 12.99$
Lego parts: 117
What does it do: Using the handle at the rear one can upper and lower the handler arm. The B set is a motorcycle with a side car.

8046 Helicopter
Price: 19.99$
8047 Mini excavator

Lego parts: 152
What does it do: We can move the main and tail rotor in sync. Another handle operates the lifting winch. The B model is a seaplane.

Price: 24.99$
Lego parts: 252
What does it do: Working treads, knobs to control the excavator arm. The cabin can be rotated around completely. The B model is a treaded handler.

8048 Buggy
8049 Log handler
My favorite so far is the Buggy - one can pack a lot of technics in a small space in 2010!!
Price: 39.99$
Lego parts: 314
What does it do: Suspension on all four wheels, the front wheels with functional steering and the rear wheels drive a V4 engine. The roll cage can be opened. The B model is a tractor.

Price: 59.99$
Lego parts: 525
What does it do: The tractor has steering, the trailer can be attached and detached. The lift arm on the trailer can be operated pneumatically.

Source: TechnicBRICKs. Pics: album.