[Radiant] 3rd party host, need to update?

[Erik Mallinson]

Hi,
I realize this is a stupid n00b question but I haven't the time this 
summer to dedicate towards learning Ruby, RoR, and Radiant that I was 
hoping for; I'm hoping kind soul will answer my question instead.

If I use Dreamhost do I need to upgrade to 0.5.2 because of the RoR 
security updates? Doesn't Dreamhost install RoR?

Bonus question: What's a good place to learn the ins and outs of SVN? 
I've installed Radiant via SVN and I'd like to upgrade in that way too.


Thank you,
Erik Mallinson