Check these two images, they are images of the same feed in Bloglines and Google Reader.
Click on the images for larger size
They are almost the same, except for one small thing. In Bloglines feed, the category chosen by the author/writer is shown, whereas it is not displayed in Google Reader. The category being shown is especially useful when the feed is of Blog-Filters like Desipundit. There are so many posts linked to by DP that knowing the category helps a lot in filtering the posts.
Google introduced labels in Blogger Beta, hope they start showing those labels in the Reader.