Talk to me of Browsers

Howdy,

I am a relative Squeak newcomer and I'm trying to get a sense of what 
sorts of options there are for me to work with.  My question tonight 
regards browsers.

I am running the 3.9 (7067) image and am using the default browser it 
comes with.  However, I've loaded up some other images and they include 
a different browser that seems to support Traits (whatever they are 
exactly) and more refactoring tools.  However, after some brief 
experiments that browser seemed a bit buggy to me -- I couldn't browse 
instance variables for instance, and asking for the 'senders' of a 
message threw an exception.

On these mailing lists I've seen folks talk about: the "Traits Browser", 
the "Omni Browser", and so on.  On SqueakMap I see something called the 
Refactoring Browser that requires something else called "AST".

Can someone give me a breakdown of the currently supported browsers and 
why I might choose one over the other.

I don't mind advice of the sort: "Use this one!"  That would be great.

Thanks in advance.

--
Jeffrey Straszheim
http://straszheim.50megs.com