affronted fowl: the web! Angry Birds' web client is built in WebGL, so presumably browsers other than Google's Chrome should be able to run it as well, and even if you can't handle WebGL, there's Canvas support too. 60fps are promised on most modern PCs, and we've spotted SD and HD labels, suggesting there'll be a choice of quality to match your computer's performance. Offline gaming will also be available.
Chrome will get some exclusive content, such as "Chrome bombs" and other cutesy bits. Rovio just noted it's "really, really happy about the 5 percent," referring to Google's pricing model of charging a flat fee of 5 percent to developers on in-app purchases in the Chrome Web Store. Yes, the Mighty Eagle will be a purchasable option for the impatient among you. The game will be available in the Store immediately after Google's I/O 2011 keynote, so look out for it shortly.
Update: And the Angry Birds have landed. Hit up the source link below to obtain the free app.