advertise on TV get featured on oprah, the today show etc you will get a ton of links, right away www.ereleases.com www.prweb.com both companies will get you 1000s of links in 24 hours. when you get a lot of links quickly....you get a lot of traffic quickly...and thats about it. NOWHERE has Google EVER said they penalize for getting links too fast...but you can be penalized for linking to spam sites, or for specifically trying to buy PageRank.
I got 10,000 backlinks in 2 months on one of my blogs and saw it's rankings have an extremely strong improvement
Of course they won't penalize you/it's a guess as i've never tried/, however if you get many links (like times more than these that you get naturally) at once they will likely just ignore them. As someone said above I also doubt any SE will leave an option to change the rankings of your competitors simply by creating thousands of links to their site.
Building links quickly in a wise and efficient way. Don't just acquire links from every site on the web. Select only those trusted ones. How do you know if its a trusted one? Visit the site you wanted to acquire link and research about it.