Yes, it' s very normal not to mention salary during an interview. 

My husband always asks me, "Well, how did your interview go. Was the salary what you are looking for?" When I tell him it wasn' t even brought up, (especially on a second interview), he shakes his head in disbelief.  He has always said he would not even go on an interview unless they gave him the salary range they are offering beforehand. (He' s also been at the same job for seven years, so he' s having a hard time rationalizing today' s job market, as I tell him everything that' s changed). 

However, I also go against what is recommended in that I always put my desired salary range in my cover letter, so I don' t get replies from companies that are so far off on what they are paying that we could not even come to an agreement.  I am a non-degreed  Full Charge Bookkeeper/Office Manager, and work for small companies.  I have 22 years of experience in this field, and find that the salary norms in my area range widely from about $35,000 to about $50,000.  My desired salary is in the middle.

I also had a second interview yesterday, for an Accounting Manager position, with a company that is also only 5 miles and about 15 minutes from my home.That' s exactly what I am looking for.  I have had to travel 45 minutes to a hour one way my last few jobs, and am really tired of it, too. The owner met with me almost three weeks ago.  Yesterday I met with his father, who I am assuming is a silent partner in the company.  The son did talk to me again after the interview with his dad, and brought up the insurance plan.  So, since he was the one that brought it up, I asked about other benefits.  He even showed me the employee manual, and vacation time, etc.  He stated that the vacation time offered would probably be better than in the manual.  He even printed the insurance information and gave it to me. That' s the first time a company has given me that without making an offer. 

However, salary was not brought up either time.  I did not pursue this job: they found me by my posted Monster resume. I am hopeful, too, because if offered at an acceptable salary, I am taking this job..  His dad wanted to check my references, and since I have had six job offers since Jan 2006, I think my references are okay.  I' m keeping my fingers crossed. 

At least you are getting ballpark figures.  If they bring up salary, it is safe to talk about it.  You, however, should never be the one to bring it up in an interview.

And, yes, it can take weeks, or even months, to get a final decision.  I interviewed with this company the first time February 5th, and here it is almost three weeks later, and still no decision.

Keep the faith, but keep looking, just in case.  Hope you land the job!!!