If people rely on the advice, and get harmed, it is likely that they will be interested in seeking recourse. It is frustrating and expensive to defend yourself in a lawsuit, even if you are right. Lawyers, particularly on Avvo, walk a fine line between "providing information only," which gives people the tools they need to make their own decisions, versus "providing advice," guiding them towards a particular decision. Disclaimers go a very long way to ensuring website visitors understand exactly what they should expect, but another option would be to have qualified professionals write the technical content in the manner they are trained for, with contracts in which they accept responsibility for their own content. Many lawyers and accountants would be happy to write general articles for free if they knew it would generate publicity.
Of course, this response is intended as information, not advice, and you should consult a lawyer in your jurisdiction for more comprehensive answers. ;)
I'm a lawyer, but I'm not your lawyer unless we sign an agreement. While my practice involves a wide array of national and international issues, I am licensed only in Louisiana- where the legal system can be unique. The brief informational response provided here is not a substitute for legal advice, and you may need to act promptly to preserve your rights.
You can limit but not totally eliminate your exposure by having a good disclaimer written by an attorney for your site. Find a good attorney and have them advise you before you start.
In addition to a simple disclaimer, you can also form a business entity which provides limited liability protection (e.g. an LLC), as well as speak with an insurance broker about obtaining an insurance policy to cover your business for these kinds of claims and/or lawsuits. There are also attorneys whose practice focuses on websites like the one you've described, and who may be able to help you proactively avoid lawsuits.
If you're interested in this, I would be more than happy to meet with you and discuss your options.
Small business legal services.
Serving LA and the San Fernando Valley
The response and opinions above are for informational purposes only, and are based on general principles of law which may vary from jurisdiction to jurisdiction. The information above is not intended as legal advice, and there is no attorney-client relationship established by this answer. It is highly recommended that you seek the advice of a qualified, licensed attorney in your jurisdiction who can provide a more thorough opinion based on your individual circumstances.