On Blogger you have the option to add a jump break to your posts, so the posts will be displayed with just a short summery on the home page and a link to read the full post will be below.The jump break has a number of great advantages, if you display full posts on your home page it will severely slow down the load time, Also With the jump break in place visitors that land on your home page will see a selection of your posts without the need to scroll.It's also more professional looking and as visitors have to click through to the full post it increases page views.
Update again 05/12/2012 - If you are using this hack you will notice it stopped working.The script caused this as it stopped working.I have added a new script here so it works fine but if you added it before the date above you will need to make a change.
Simply find this line of code in your template :