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Features of OSGi Enablement http://cwiki.apache.org/confluence/display/TUSCANYWIKI/OSGi+Enablement+for+Tuscany+Runtime
Overview of how Tuscany fits in with OSGi http://cwiki.apache.org/confluence/display/TUSCANY/OSGi+Aware+Programming+in+Tuscany
Devloping with Tuscany (with some points on how to bring a module into Eclipse PDE if you want to) http://tuscany.apache.org/sca-java-development-guide-osgi.html
Thoughts on how to get the branch changes merged into trunk http://cwiki.apache.org/confluence/display/TUSCANYWIKI/OASIS+Development+Stream
Presentation about hooking into Equinox http://www.eclipsecon.org/2008/sub/attachments/Equinox_Framework_How_to_get_Hooked.pdf
Older Links
http://wiki.apache.org/confluence/display/TUSCANYWIKI/OSGi+Integration