Make sure you are interacting with your readers! If you are not doing so, your are not blogging.
Write something useful for your readers. Share a relevant piece of information, an event update or a hack that makes a task simpler
Avoid using SMS abbreviations in blog post and at least run the post through a spell-check in MS-Word before publishing. If the bloggers cannot take the time out to write proper English, why would the readers bother reading through that cryptic puzzle?