Ajax is pretty much useless if not cded properly. So the answer is maybe
Temi, rather than have a list of what spiders will and will not spider, it is better to say that if links use 'href=' , then they can be spidered and carry link juice.
Google WILL read javascript, and also flash, and WILL pull out urls as well. BUT they will only be added to the google 'to be crawled' database and when they get crawled the page where the urls were found will not pass on any link benefit (juice).
One point here, many people confuse the term 'link juice' to mean PageRank (and it it pisses me off). Link juice means a HOSt of things,
PageRank
Anchor text link benefit
Authority trust benefit
to name 3.
If we are not careful, we will end up with the term 'link juice' going pretty much the same way as 'seo' in that people will be using it without really understanding what it means. Personally I DESPISE the term SEO as I do not optimise search engines, I am a web marketer, I make sure website are the best they can be for both users and the search engines, I make sure the sites can be found by as many routes in as possible. So SEO is a load of crap to describe what I do, as the search engines are just a PART of the overall package.
E.G. I got one of my clients a half page spread in the Sunday times colour suppliment for free, as I wrote a good informative quirky piece for them and I got it picked up by the PROPER press release agencies.
[ Rant over ]