I'd been using Foxit PDF reader because of its small size and corresponding fast startup speed. That has ballooned to 200MB now as well, and I'm now using the PDF support built in to the browser (Firefox being my browser of choice). Firefox is, as of today, a 68MB download for the installer, and it does a while lot more than display PDFs.

A little disgusting that Adobe creates a file literally 10x the size of a full-featured browser yet having a small subset of the functionality.