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TDS readings

I recently had the opportunity to pick up a TDS meter at a bargain price, and 
have searched the web to see if I could learn enough about Total Dissolved 
Solids to make the readings useful.  Frankly, I'm confused.  I understand I 
am coming up with a number that corresponds to all the chemicals dissolved in 
water.  However, I'm not sure what a "good" TDS reading would be, and when it 
gets so high that it's a "bad" reading.  My tapwater tests at TDS=400.  Now 
that I have that number, what does it mean, and what (if anything) should I 
do about it?   Do I even need to be concerned about TDS at all?