Lazy Load is a jQuery plugin which only loads Images seeable in the viewport (visible part of web page) thereby enhancing the Page Load time. The images which are out the initial visible region of the screen are loaded as the users scrolls through them. A really useful plugin for Image intensive Blog's.
Many have heard of Google Voice Search - It allows you to speak through the microphone to populate the input field (something like Siri minus the answer back feature).
Pagination or Page Navigation as it is called is not inbuilt into Blogger, but can be achieved with a simple hack. The main motive behind it is to make your Blog look more organized and make navigation easy for your visitors. Its simple and easy to integrate and styling can be changed as per your wish.
A forum is a great way to interact with the readers of your blog and let them connect with each other. In this post I will show you how easy it is to add a free forum to your blog using a free Hosting & Vanilla Forums. Vanilla Forums are considered to be the best forums around the web mainly due to the sheer number of customization possibilities present. This tutorial is a bit lengthy and involves some geeky things . 
Supersized is a jQuery plugin that automatically resizes (background) images to the size of the browser while maintaining image dimension ratio and runs them as a slideshow in simple words its a Full Screen Slider.
Any Websites Load Time is a vital factor in its ability to engage its readers. Studies show that users leave a site if it hasn't loaded in 4 seconds. Knowing the above facts it becomes really important to optimize your blogs accordingly. The main services for this stuff are Google's Page Speed and Yahoo's YSlow but both are bit technical and not that graphical. Here comes the Service called GTmetrix.com ,it combines the results of the above services and is bit more easy to understand.Not only does it provide suggestions it also provides actionable recommendations to fix those.
As asked by some of my readers, here’s a tutorial on how to add a Side Floating bar of social media buttons to a Blogger blog. I made it into a gadget, so you don’t have to go into your template HTML to install (or remove) them. Just drop the whole code into a HTML/Javascript gadget.