I work in IT as a QA Analyst for a large medical supply company. When I started dreading, no one was surprised, and you know, no one really cared.
I would hope that in this day and age, more and more employers are really starting to see that putting people in a 'suit and haircut' doesn't always make them 'productive' or 'good' employees.
We still have a corporate dress policy, but it is very relaxed. Most of the time it is supposed to be business casual, but most of us wear denim. I tend to dress up when we have suits or upper management in town, or if we're meeting with consultants etc: I have yet to experience anyone saying anything to me about my job performance related to my dreads. I could have seen this happening had I continued to try and dread the DHHQ way though 
According to them, the work I was supposed to put into my dreads would have been a full time second job!!
Before I started the dread journey, I didn't look at the corporate policy until after I was well on my way. It says nothing about dreadlocks (or piercings or tattoos), it just says that we need to be clean. Most people who have asked me about my dreads, have asked if I am blogging to show the time line (no) or if they can touch them (yes) or if I am rasta (no)
I don't see them getting in the way of anything unless someone has a stick up their behind, which in some cases, there are probably some people out there who do, but most employers I know, are aware that hair style does not reflect capability in any sense.
