Really depends on what you are using.
I use RDC for Mac (remote desktop connection) to connect to my Win systems (since VPC is currently not supported which I purchased so I am waiting for an update). When I was @ 1 GB, I could connect and perform operations fine, but the performance was a little slow when I had other processes running (i.e. I would get the beachball often). After my upgrade, I have noticed that I do not receive the beachball as often, and my app transitions are generally a lot smoother.
So the bottomline is that it depends on what you are doing, but you should notice overall systems performance improvements if you have a baseline to compare it to.
You can never go wrong with adding more mem - unless it turns out to be bad mem
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Good luck and congrats!