Posting pictures of your class is a great way to get parents involved and increase traffic to your blog. The downside is that pictures take up quite a bit of space on the blog. Before the year is out you could be at your limit. Picasa allows you to display your pictures on your blog without taking up any space.
All you need to do is upload your pictures to Picasa. Picasa provides you with an embed code to display your pictures on your blog. You can even display a slideshow. Click here to get started with Picasa.