Without injections. If that makes sense.

And what is the difference? Is there a difference in the effectiveness?

gel and cream and maybe patch (not sure)

Tablets damage your liver.
Pellets are placed via incision in the fatty tissue in your abdomen - every time they're placed it involves a minor procedure.
Gel you have to be vigilant with applying and be careful what you come into contact with afterwards, general consensus is changes are slower.

They have a slow release T injection now - its one shot every 3 months, 4 shots a year sounds better than 1 evey other week to me!! And changes are generally the same.

yeah cream is basically the same as gel but it's cream as opposed to gel.  My friend is on it and his voice hasn't even changed yet, after 7 months on.  But he's about to get a hysto. 

Pellets are good for guys who have a lot of anxiety about their shots or about the process of actually applying the cream or gel because you only do it once every few months or so. 

I'm curious about this slow release injection. 4 shots a year is much better for the muscle. Who has more info on this?

Nebido is the slow release injection. I can't mention doses here, but it's a very large amount of thick, oily liquid. Takes a good few minutes to inject, so you'll need to get it done by a professional.
Changes are generally slower with Nebido as it takes a while to get your T levels up. Although some doctors like to start you out on other forms of T and then use Nebido to maintain levels. It's not uncommon to keep getting periods, or even for your periods to come back after switching from another injectable. It's quite popular in the UK so there are quite a few YouTubers documenting their changes with it.

Also, I came across this: http://doctorz.wordpress.com/2011/03/15/different-types-of-testosterone/

isnt that something women take as birth control? 

FWIW I'm on Reandron (Nebido for those of you in parts other than Aus) and yes it is a large injection and a slow push and it does sting from time to time but nothing too bad!! And I have done it myself and had mates do it too - though granted I and my friends have medical training, but it's the same as any other shot mate.

Changes in my opinion were stock standard - my arm hair is the slowest thing to come in yet! My GP started me on the shot every 6-8 weeks to get my T levels into the normal male range and now its the standard 10-12 weeks between shots. As for the monthly visitor, I started T in the Nov and have had one period in the Dec since.

But research it for yourself mate, this is just my experience. Watch my youtube vids if you're keen to see the changes and timeline etc.

I think that stuff about tablets damaging your liver is outdated. No one seems to get their t that way anyway - but maybe its for some other reason.