It may seem odd to review a computer store, but Micro Center is not that well known. They are a chain with 20 locations across the country and the Cambridge store is the only one in New England.
Micro Center carries everything you need to build a PC, every cable you might ever want, every switch, every form of media and case, etc.
They have a large central shopping area filled with parts, add-ons and software. On the side are rooms for selling Macs, PC's, monitors, cameras, pda's, printers, scanners, etc. They also have one of the largest, if not the largest selection of computing books and magazines.
I always check Micro Center when I need or want something. Odds are they have it or something similar. I may decide to buy online or from another store but Micro Center is at the very least a huge resource for investigating. I've also spent way too much money there over the years.
Located near the BU bridge. Shares a lot with Trader Joe's.