Had a look at a few threads but didn't find a nice summary of it all in one thread, so...

What are the vaccinations people generally get for a long trip (personally mine is around the world)? And what vaccines are usually passed off.

I think the top 3 in my list are yellow fever, rabies and malaria tablets.
Already have measles, mumps, rubella, tetanus/diptheria.

What are the thoughts on Hep a/b, meningococcol and polio?

Anything else?
Cheers and healthy travels!
Rossy.

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'10 Suzuki DR650. 2011-12 Sth-Nth Chile-Alaska. Currently in Cairns, Australia. www.followtheakubra.com.au

Hep A+B is a must, maybe C if it can be done as well, Polio is now back on the agenda in some countries, check out with doctor, that is my advice, but take with him the countries you are intending to go to and in some sort of time sorted order

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www.travellingstrom.com

I am about to go on a trip around the world too

You should bring more than one type of malaria pills. Most types of malaria in Africa, South America, and Asia is Chloroquine-resistant (Malarex or Ercoquin), and in certain areas of SE Asia Mefloquine-resistant (Lariam).
Furthermore, should you be diagnosed with malaria, the way to treat it is by taking a large dose of another product than the one you use as prophylaxis.
Ex: You buy some Lariam and Malarone and take one Lariam-pill each week, like you're supposed to, but get malaria anyway. Then you treat it with Malarone, taking 4 pills a day for 3 days, and you should be fine.

I will be bringing 12 months worth of Lariam for prophylaxis and 4 packs of 12 Malarone pills for treatment and prophylaxis when travelling through Vietnam and Thailand.

You can read more about malaria on this excellent website Chapter 2 - Malaria - 2010 Yellow Book | CDC Travelers' Health

My doctor says, rabies vaccine is pointless, because if you get bitten, you will need medical attention anyway.
I also chose not to choose Japanese Encephalitis, but if you expect to spend more than a few weeks in rural areas of SE Asia, you should consider it. It is a very expensive one.. 1000DKK ~ 200USD for the shot..
If you are getting the Hep A/B vaccine (you should), they give you two shots, which will last a year. I got it prior to deploying to Afghanistan, and when I got home 7 months later, they gave me a third shot, and said it would then last 5 years..

best regards
Christian

what about Aisa/Japan i think it is called encferlitus? to do with the water

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We are the Pilgrims, Master, we shall go Always a little further: it may be beyond that last blue mountain barred with snow, Across that angry or that glimmering sea.

I think this is the disease you are looking for:
Here are some statistics from my travel medicine book:
Mosquitoes get the virus from pigs and carry them on to humans. About 1 in 2000 who get the virus, develop the actual disease. The lethality is 10-50% From 1978 to 1992 there has been 24 incidents of tourists from North America, Northern Australia, or Europe developing the disease. The chance for a tourist to get the disease is estimated between 1/200,000 and 1/1,000,000. For American troops in the Korea and Vietnam wars the risk was 1/10,000 per week.
Due to an increase of Japanese Encephalitis on the Indonesian island Bali, the vaccine is recommended to people travelling to Bali, people staying in SE Asia more than 3-4 weeks, and people staying of outside urban areas during the transmission period. The most important thing though, is to avoid mosquitoes altogether by use of repellent and mosquitoe nets.

These are the transmission periods for the different areas:

Cambodia: March through October
Northern China: March through September
Southern China: April through October
Indonesia: all year
Philippines: all year
Northern Thailand: March through September
Southern Thailand: all year:
Vietnam: March through October