Most feed readers let you import and export subscriptions using the OPML format. For Google Reader, you find this option in Settings > Import/Export. But what happens if you want to export the feeds from a single folder so you can share them with a friend or upload them to a site? Google Reader lets you export the feeds from a Public folder:
http://www.google.com/reader/public/subscriptions/user/USERID/label/FOLDER i.e. http://www.google.com/reader/public/subscriptions/user/00907783891347362261/label/humour (you should replace USERID with the appropriate userid number and FOLDER with the actual name of the folder)
This can also be used if someone shares a folder with you and you want to obtain the list of subscriptions from that folder. If someone shares a folder:
http://www.google.com/reader/shared/user/13577231804381328821/label/googlers, then you can easily obtain the link to the corresponding OPML file by replacing shared with public/subscriptions i.e. http://www.google.com/reader/public/subscriptions/user/13577231804381328821/label/googlers
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