if you're planning to create bulk backlinks to your site you can start blasting it right away. Because at first you're not ranking high with your website anyway so when it has aged a bit your site has backlinks already it can handle future blasts without any problems.
do manual web 2.0 links and then blast those instead its safer
I don't know about others, but I normally blast my site after I complete my site immediately.
xenix9 said:Blast right away - but don't forget high quality back links !
You should be on page 1 in 3-4 weeks !
I just sent 200 linkpushes to a site that was not indexed yet and it is doing fine. Each push went to a different page.
i do a direct 25k sb blast on the second day to let google know who's boss