Yes, there are a few good sites for finding plain English translations of computer terms.
The Free Online Dictionary of Computing, also known as FOLDOC, is (according to its creator) "a searchable dictionary of acronyms, jargon, programming languages, tools, architectures, operating systems, networking, theory, mathematics, telecomms, institutions, companies, projects, history, in fact anything to do with computing."
Yes, but does it come with free steak knives?
FOLDOC - http://foldoc.doc.ic.ac.uk/foldoc/index.html
WhatIS.com is a computer and Internet dictionary and encyclopedia. It contains over 4,500 individual encyclopedic definition/topics, a number of "Fast Reference" pages and learning tools. The topics contain about 12,000 hyperlinked cross-references between definition-topics and to other sites for further information. The site is constantly updated.
WHATIS - http://www.whatis.com
If those two sites don't help you find the knowledge you seek, try Yahoo's "Computers and Internet > Dictionaries" category here:
http://dir.yahoo.com/Computers_and_Internet/Dictionaries/