Susan,
My wife was diagnosed Nov '05.
It is good that you are learning as much as possible about your cancer. I found that it is important to know what you are dealing with - and that you are able to understand what your doctor is saying to you throughout your treatment. Keep researching and asking questions. You can beat this.
To answer your specific question about Her2, it looks like you had a test called IHC to test for HER2 status. This test looks for the amount of the her2 receptor protein on the surface of the cancer cells. It scores 0 to 3+. 0 and 1 are generally considered negative for Her2 while 2 and 3+ are positive. You may want to verify by a second genetic test called FISH (fluoro something or other hybridization - just call it fish). This test looks for extra copies of the gene and is either positive or negative (you either have it or you don't).
Here is a good resource that explains the two types of tests:
http://www.breastcancer.org/herceptin_treatment.html
By the way, CPA is for Central PA - I am not an accountant!!! We have had very postive experiences at various hospitals throughout the state for surgery, consults, etc. If you have questions, just ask.
ER/PR status is also important for treatment options.
If you are pre-menopausal, and ER+ you are a candidate for tamoxifen. This is in pill form and you will probably take for 5 years.
If you are post-menopausal and ER+, you are a candidate for an aromatase inhibitor. Arimidex and Femera are two on the market.