HTML likes to gobble up white space, so if you're pasting in source code you use the PRE (preformatted text) tag. PRE shows up in fixed width font and preserves spacing; however you can't place < or > in PRE tags since they denote HTML tags, instead you need to use < or > (character entity references if you speak techno babble). This is annoying, especially given the blogger text editor gets confused when you edit PRE tags with nested < and > signs.
Luckily, SyntaxHighlighter also supports an usage where you use specify your code in PRE blocks. It's more annoying for me (for the above reasons), but it's better for my beloved readers since the PRE elements 'degrade' to non syntax highlighted pre blocks (instead of nothing) when in an RSS reader.
For all my RSS reader friends here is the snippet from the last blog post:
print "Hello World"
(*) CDATA,aka: character data, is not interpreted as part of the document. In CDATA, > means greater than and does not have to be written as character entity references. Unfortunately CDATA can not be placed in PRE blocks.