How to show the RECENT POSTS and RECENT COMMENTS, this is too simple. This is what we can make with the BLOGGER's default widgets.

To add RECENT POSTS:
-Go to LAYOUT
-Select Add Page Element
-There you choose some suitable place to place the widget, then click on Add a Gadget/Element
-Now select the FEED from the shown list, this will open in separate window

Here you enter your FEED URL, it must be http://www.yourblogurl.blogspot.com/atom.xml

Change the yourblogurl with the URL and press continue, existing window will be replaced with another one, here you put your desired information.

Same like that you can add RECENT COMMENTS, but the difference is, that you must enter the http://www.yourblogurl.blogspot.com/feeds/comments/default insteat the http://www.yourblogurl.blogspot.com/atom.xml
The process is the same.

If you like the TRICK, then DIGG IT!