Hey Taurus, there is no agreement between medical personel as to what works with snake bite, and there never will be so long as the people who spout off their "expert" opinion have no experience with the things that they condemn.
There are several things that work to certain degrees and as chris says there are things that work in a real bad way, possibly causing much damage. Poultices work period, to draw out venom, for infections and they work for poisoning and stings. Before the days of doctors being representatives of the drug companies their use was widespread and they do work. For snake bite they would work slowly though and you would need to have a large poultice to have it draw out sufficient poison. I can't explain the mechanism as to how it works or how deep it works, but from my personal experience and those of our ancestors it is at the very least a backup treatment, it also can't hurt.
The most effective first-aid method, which I know from personal experience works, is a High Voltage Direct Current Electric shock (20kv), like from a small petrol engine spark system.
Just as doctors say not to suck out the venom, they also often say that people should not use electric shock. They say that sufficient testing has not been done to prove it's effectiveness. The doctors who write that have never used it to treat any bite or sting on a person. Over 1000 people have been treated in Ecuador in a government endorsed program in a hospital there and they have had no deaths since the program started. Before they were losing 5% of the victims. The morbidity (loss of tissue etc) went from 20% to 1%. This program took place from the mid eighties and continues to this day.
There are quite a few doctors around the world that use this form of first aid and also missionaries who have used it because they found that it worked.
Further reading on the subject can be found at
First Aid Venom Shock Wiki Site That is a site that I help administer, although poorly at this time, it needs to be cleaned up and reorganised a bit, but what can I guy do when he is getting ready for a wedding? There is quite a bit of information on it though and it is well worth a browse. I know the guy personally who initiated the study in Ecuador, Dr. Ron Guderian. and I also know from personal experience that it works for bites and stings.
I have also designed a mechanical device for the third world that can be wound up and will deliver a shock to the site of the bite. This is not something that I am getting money from, I do it because I have found personally that it works and there was no other device out there that would work in the third world without batteries.
Menonite friends of mine have used cattle prods (8kv approx) for copperhead and rattle snake bites as well as brown recluse spider bites, with great success. These were not dry bites either. People have also found it effective for preventing anaphalactic shock due to stings as well.
There is a topic on this forum about the subject that goes into it in more detail.
Snake Bite, Insect Bite and Stings This is a device that is made by some people in Italy that is a low powered stun gun that they claim works, although I have had no experience with it.
Technimed - Ecosave 
There is also a low powered stun gun (25KV) that is made by a guy out west (Oaklahoma)I can put you in touch with him if you want. It is important to not to use a stungun or HVDC source that is too high in voltage. If the voltage is too high (in excess of 100KV) you can possibly get some tissue damage from the shock. This is not a problem if an appropriate voltage source is used.
I wish you all the best in your research,
Cheers,
Mac.