I think that in the end, vows can be both a good and a bad thing. A vow that was made in a past life can drive you to find out certain things or to persue goals and career paths that are beneficial.
Take for example, someone sees a horrible murder in a past life, and they vow to never let it happen again, so in the next life they become a police officer so they can protect others from that same situation. I think that can be very beneficial.
It is only when a vow is detrimental to a person or when it becomes the focus of an unhealthy obsession. Then it becomes something bad and should therefore be neutralized.
As for the article itsef, I agree with what Honor said a while back. I would be suspicious of anything that comes from a site that dedicated primarily to selling something. Plus, no offense to anyone for who that particular technique worked for, but I, myself feel pretty hokey standing in the middle of my living room poking myself in the throat 10 times and then holding my hands out and envisioning the energy work. Then again, thats just me.
I think that breaking a vow- especially an important one- is a very private matter, and the method of doing so should be very individual and personal. I.E. everyone should figure out what works best for themselves and use that. If that article helps them, then more power to them, but it should only be viewed as an example, not gospel.
Of course, thats just my .02