Cracks appearing in interior walls...what to do?

Almost two years ago we moved into this house. The original part of the house is a colonial built in 1939, 2 story w/ basement. In the late 50's / early 60's a large den / kitchen expansion was built onto the house with basemenet adjoining the orig basemenet. 5-7 years ago a 2nd floor was put atop the den / kitchen expansion (I've got the permit records for that but not the orig expansion).
In the past few weeks I noticed that along the ceiling / wall corner in the bahtroom that is part of the most recent, 2nd floor expansion a series of cracks up in the corner running around a good part of the bathroom (3 walls - drywall). I went looking and found that there is a crack between the plaster wall and moulding going down the main staircase that was part of the original house - easily determined as it has cracked part of the paint that was just applied 1.5 years ago. The bathroom and kitchen under it are part of an overhang that extends off the newish den and are supported by the orig house at one end and a series of 2x2's that sit on a brick retaining wall at the other side - not sure if the wall is reinforced underneath. Felt should eventually augment support at that end w/ footing and a series of new 2x2's not on the wall itself.
The original part of the house is brick 1st floor, masonite siding 2nd floor (on the side of the house the basement is exposed and that wall is brick so there's 2 floors of brick on one side). I notice no stairstepping in any of the brick, nor patches from earlier stepping.
The time we moved in saw more rain in the area than had been present in nearly 100 years. There are two under-house drainage pipes that run into a gutter and they drained for months after we moved in. They've been rather dry for a year aside from recent bit of activity due to recent frequent precipitation, but nothign like before. I have sump pump in the finished basement room (part of 2nd expansion) and it hadn't kicked in for a year but did run a few days on and off a 3-4 weeks ago.
So...not sure what is causing this. I guess my real question is - who would I get in to determine what is going on here? A structural engineer?
Thanks for any help.
bp
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I just did a better inspection. There are cracks along the plaster wall / ceiling moulding in areas in all of the 1st floor parts of the orig house. These are visible becasue everything was painted and it's plain to see what has happened since that painting 1.5 years ago. In one room there is a long hairline crack that runs along the plaster wall itself, turns a corner, and keeps going. Doorframes between rooms show moulding cracks. I am getting concerned now...
bp
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Blake Patterson wrote:

It is hard to see from here. Some cracks in older homes are expected. Some however can be a sign if serious trouble. Don't assume the worst but do check it out.
--
Joseph Meehan

26 + 6 = 1 It's Irish Math
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You want a professional engineer. Check yellow pages ads. Usually they specialize but if you call the wrong guy he will probably refer you to the right guy.

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I'll be looking for a professional engineer come spring regarding some new stair-step cracking at a corner of my block foundation. Quite a few in the yellow pages - any tips on picking a good one? Asking around for references has gotten me some mixed results thus far.
Banty
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Might sound silly but you could call a lawyer who specializes in defective residential construction litigation and ask who he recommends. His expert would have to be highly qualified to survive cross examination and easy to understand. I found 2 that way.
Art

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