I realized when I was re-reading this post that we have alot of people from the "logic section" era of the GRE, and alot of people from the "writing section" era. Confusing!
Probably when your school was asking for atleast a 1500, this was when they were using the old GRE that had three sections counting for 800 points each. Now that the GRE only has a verbal and quant. section, and has a new writing section scaled separately (1-6), they are requiring their verb/quant. composite to be a minimum of 950.
I think it is probably easier for us to all talk in terms of section scores (ie: M/V=600/600) just so we are all on the same page... since, for example, 1500 composite on the new GRE sounds very competitive, but the same composite score is not as competitive on the old GRE scale?
Most schools are starting to require the new test now, so pretty soon we'll all have the same scoring system.