Wow, three posts in one morning, I must be bored. I just found out about a kickass feature that I wish I had known about sooner. There is a setting for Google Reader that will add a Send To link at the bottom of each post. They have settings included that are pre-configured for many top sites like twitter, tumblr, facebook, instapaper, etc. So you check a few check boxes and then you can easily tweet, share, mark for later to your hearts content! I had been looking for a feature like this for twitter for awhile and it was there all along. There is also the ability to add a custom link for other services.
If you want to try this out for yourself, just open up google reader and then go to Settings -> Send To. From there, just select the services you want and they will be available. It’s that easy. I found this out because Pinboard had a blog post describing how to create a custom Send To link for google reader. If you care about my original opinion of Pinboard you can read that post here.