WordPress Multisite 101 (tech.ipstenu.org) Mika Epstein and Andrea Rennick wrote an awsome little book about Multisite. It's pay what you want (so you can get it for free) and I can't wait to read it. (I payed more then $0 and so should you ;) )
GD Star Rating 2.0 Alpha #1, Internal (www.dev4press.com) GD Star Rating, the only rating plugin I've ever used is closing to version 2.0. Current tests show that plugin needs only about 1.0 to 1.5 MB of memory (current 1.9.16 needs up to 5 MB), and it is very fast.
Add Screen Options Tab to Your WordPress Plugin (pippinsplugins.com) You have probably noticed the Screen Options tab in the top right corner of many WordPress admin pages. This tab brings down a configuration panel that you can generally use to control what elements are displayed on the current amin page.