I have been diagnosed quite a bit longer than you (January 05) but I understand your concerns about potential cognitive effects of Parkinson's etc etc
As GG says impulsive and compulsive behaviour is a possible issue especially if you are taking dopamine agonists. Definitely worth talking to your neuro, nurse etc.
Thinking and memory impairments can occur for a variety of reasons. You should not assume that because you have Parkinson's that issues like forgetting a few names are a result of it. Depression and anxiety are common sidekicks to Parkinson's and they don't help you think clearly. They may be caused by Parkinson's, by the meds, by the fact that you are worried about your job or by something else. In my case lack of sleep was a contributor to reduced mental acuity. In any case it is worth talking to your neuro, nurse or GP about it.
Have you told your employer about your diagnosis? In the vast majority of cases you are not compelled to inform them (brain surgeons and airline pilots might like to check the small print). It can be helpful to tell your employer if you think that your condition is affecting your work. The Parkinson's UK helpline can offer advice on all these issues. One of the guys on the team specialises in employment issues.
I hope that helps