For the adafruit kits, from the order page click the link to the project's individual web page, and the then "downloads" to find eagle schematics/etc. Parts lists are usually on the first couple pages of the "Make it" link from the project page.
For BoArduino:
http://www.ladyada.net/make/boarduino/download.html
http://www.ladyada.net/make/boarduino/dc-parts.html
http://www.ladyada.net/make/boarduino/usb-parts.html