How to retrieve part information from Digi-Key automatically
You'd want to use the detail option instead of the keyword.  Like this:

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&amp;name=458-1003-ND

That returns an HTML page which is text which can be parsed.  It's all in table format so you can create a list of terms you're interested in and parse out the values.  I can see a parts list script that takes in a list of parts and the values you want to retrieve (ie, Voltage, Max Current, or however Digikey lists it) and then make some Python to read the part number, grab the page, parse out the info and stick it in a CSV, database or HTML file.  I've been thinking of something similar and it doesn't seem too hard.  Well, hard enough to stop me from whipping it out right now anyway :)