<p>After the suggestion to use a library for <a href="https://stackoverflow.com/questions/34486/what-more-is-needed-for-ajax-than-this-function">my ajax needs</a> I am going to use one, the problem is that there are so many and I've no idea how to even begin telling them apart.</p>

<p>Thus, can anybody <br />
A) Give a rundown of the differences or <br />
B) Point me (and others like me) somewhere that has such a list. 
<br /><br />Failing that plan C is to go with whichever gets mentioned the most here.</p>

To answer B:
Comparison of JavaScript frameworks
EDIT:
Although everyone and their mom is apparently riding the
jQuery
bandwagon (I use
MochiKit
), there are many libraries which provide the same functionality - the problem set which most libraries solve (async client-server communication, DOM manipulation, etc.) is the same, and there are few that don't have what you will need to get the job done.
The important thing to determine for yourself is whether or not a library will fit your particular style and sensibilities. Wide-spread ignorance about how
JavaScript
, the language, actually works, coupled with the negative press resulting thereby, coupled with the now-immense popularity of jQuery leads most people down that road. Thankfully, it isn't a bad road to be on as there are a lot of travellers to keep you company when the abstractions leak and you need help. You probably can't go wrong choosing jQuery.