Key activity when looking for reflected XSS is to check what parameters provided in request are echoed back in response. Doing that manually is tedious and that time can be spent in more productive way. For example you can write burp extension that will do it for you. So, I present Argonaut.
Extension works in very simple way - it parses captured request to extract all parameters (cookies included) and later search through response body to see if value in question has been echoed back. In such case a short snippet of match is presented to the user.
Hey, but what about escaping, you ask? No worries, I got this covered. Let's say you are testing a web application written on top of Django. Most likely you are going to use Jinja2 template engine, and it applies escaping. Argonaut will search the response body for plain parameter value (let's say test">), but will also apply various defined transformations/escaping to see if for example application returned 'test">'.
There is still work to be done. Some simple tasks will be completed soon - for example new transformations and some UI work. Others, harder - like support for contextual autoescaping libraries and type dependent parameter extraction will have to wait a bit. Anyway, stay tuned and let me know what do you think.