Yay! Amazon desided to add a LendMe feature to Kindle (it won't be called "LendMe" as that name is trade marked by B&N) in the not-too-distant future. I heard about it from here:
http://ireaderreview.com/
As of this post, the article talking about LendMe for Kindle is the most recent one. You might have to bookmark it because other articles come out quickly.
Also, the Kindle app software (e.g. Kindle for PC, Kindle for BlackBerry) will soon be able to get periodicals delivered to it.