Like the posts before me, I won't offer code, only recommendations and insight. I would start by warning you - unless you run the website you are scraping, or have an existing relationship with the owners, you may want to think twice about a direct scraping every two minutes. Not everyone appreciates having their website hit repeatedly and consistantly to scrape data.

In addition to the modules already mentioned, I'd also recommend reading through past articles. I know that both perl.com and TPJ have run articles about exactly this, perl.com in the last few months (so it might still be found on their front page, not sure).