Ryan Allen's W1000 Super Total Mega Shark Cache on a Boat on a Plane

[Scott]

So, this whole Google Group got started based on Ryan Allen's talk on WP performance
In the talk, he pointed us to his WP Super Cache replacement plugin:
https://github.com/ryan-allen/w1000-super-total-mega-shark-cache-on-a-boat-on-a-plane
Has anybody used that? its certainly not being maintained or updated, its 2 years old at this point.

I, for one, am still using WP Super Cache.
I've looked into WP Total Cache, but its gotten a lot of negative reviews. Can't be sure if its complaints of high memory usage are related to it hooking into APC or not.
I've looked a bit into Hyper Cache, but haven't had enough time to really dig in and make sure it has enough flexibility such as WPSC's features that don't show cached pages to logged in users, allowing for things like DONOTCACHEPAGE, etc.

WP File Cache is great. If I were running multiple servers, I'd definitely be using a memory-based object cache (Memcached).
Other good plugins for performance: Use Google Libraries, Better Wordpress Minify.

What have your experiences with using APC or XCache with Wordpress been?

Would anybody be interested in sharing their .htaccess hacks? Specifically, I'm interested in things like:
 - The 5G Blacklist : http://perishablepress.com/5g-blacklist/
 - Expires header settings
 - mod_deflate settings
 - other related Apache tweaks for performance.

[Scott]

Oh, and context:
Small web dev agency hosting multiple small sites. Using Rackspace Clouds Sites till we can justify devoting more man-hours to managing a real server of our own. Thus, the goal is to tweak the application layer as much as possible without adjusting the underlying technologies. Yes, yes, Nginx is on the radar for the long term plan.