Baf's Guide to the IF Archive: Spider and Web: Rated 5/5. "A real gem. I'm still discovering subtleties just by thinking about it afterwards." Includes links to play online, download, and walkthrough.
IF-Review: A Game Untangled: "Despite the linearity of the game, its ultimate meaning is entirely in your hands." By Emily Short.
SPAG Reviews: Reviews by Duncan Stevens and Adam Thornton.
Zarfhome: Spider and Web: Author's website with free downloads and Java executable to play online.