I want to dump in a csv file, tab deliminated table, mysql database, etc. of addresses and get the long/lat back - batchgeocode.com is down, every address resolves to 0/0.
There's also a free Perl-based program that uses the census bureau data, which is not quite as good as some of the commercial products, but it does a decent job and lets you run it on your computer without limits:
I found a great excel sheet that let me paste in my addresses and it pulled the long/lat from Yahoo. All you need to input is your Yahoo key - I converted it to xml and I was good to go.