I did end up sending an email to ING/Sharebuilder about the $75 bonus money I received back in January and should have been able to withdraw by today. I waited the obligatory 120 days and attempted to withdraw the funds. Unfortunately, the bonus money currently shows as unavailable for withdrawal. Ugh! Here is the response I received..errors included. 
Your wait is almost over. Our bonuses are on hold from withdraw for a few months to encourage customers to use the money towards investments. I can confirm you should be able to withdraw this money by the end of this week, you could even try to do so tomorrow. Just click on the Accounts tab > Transfer Money > Deposit & Withdraw.
That being said, this is an investment account. If you plan on making an investment, but aren't sure where to get started, take our Research Tab for a spin. Take the Research tab for a spin. You'll find helpful tools such as the Investment Screener, Market Movers, and even PortfolioBuilder if you’d like some guidance based on your financial goals and your comfort level with risk.
I will attempt to withdraw tomorrow and Friday to see if the email is correct. If not, I will email them back to see what the problem is. I will let you know tomorrow what happens!
Sharebuilder Bonus Response
May 3rd, 2012 at 12:12 am
May 3rd, 2012 at 01:43 am 1336009380
May 3rd, 2012 at 01:22 pm 1336051333
I was able to transfer my funds today.
May 3rd, 2012 at 01:24 pm 1336051499