I'm looking at pulling an RSS feed from one site and displaying it on another... the source site is WP and the target site is HTML/CSS...
Looking for best practices, not just a solution.
RSS (including the various versions/variants) is essentially XML. One method is to use a XSLT to format it to an XHTML (or HTML). There's the most straightfoward without actually getting your hands dirty doing coding/programming.
Having said that XSLT can be a real pain itself. You probably want to get a working version and modify from there.
Because browsers will not let you retreive data from another domain for security reasons you need to use a server-side proxy service. Basically, you bypass the cross-domain exclusion policy by making the request from your browser to your server-side app (tricking the browser into thinking the data is coming from your own domain). The server-side app retrieves the data (and parses it ideally) before passing it back to the browser for your to proces on the client side.
Alternatively you could use Yahoo Pipes which will retrieve the RSS for you, parse it and convert it to JSON and then return it to you. Pipes acts as the proxy between you and the feeds you want to consume. It is really easy to setup and use and the resulting JSON can be parsed with jQuery very easily.
Not much in the way of best practices other than: do it server-side, use a library, and give credit. Server-side to avoid all the hassles danwellman points out (plus why make the browser do work the server should). Library because: don't reinvent the wheel. And if you're displaying someone else's content in your site, give credit (don't steal).
If you're coding in PHP, the best library I've used is SimplePie.
I don't steal content. The content is actually my own, just looking to be able to update one site from another (my own) RSS. Thanks for the suggestions. I'll look into these options and then let you know which I've decided on.