Instructions for adding the google plus button to your website. Its is very easy. Click this link, this page mentions that a user clicking on the button may cause Google to crawl your website more frequently.
So many websites I come across are using jpg images with text inside of them. Big loss in SEO points! When designing a website be sure to type business addresses and phone numbers into the coding of the website.
Setting up an email subscription service using RSS
Using google feedburner you can provide opt in users with email subscription updates. These can come from any place where an rss feed is generated on your website. For example, blog posts, or comment steams.