It its now (the Mylar site states actual Version is 2.0 M3, May 14, means 2.0.0v20070514-1800) possible to use context attachments with the Atlassian Jira issue tracker. It was a feature I was long looking for, now I can use Jira to pass over Mylar context attachments.
To get it running simply use the Eclipse update tool, you can find it under Help >> Software Updates >> Find and Install
Go “Search for new features to install” and add the following two remote sites if you don’t have them.
The Eclipse Mylar update site:
The Jira Dashboard update site:
To get along with mylar watch this video on their site. It is the best introduction I found, specially because Mylar has a new way of integrating issues into software development which is not self explanatory. At least until you don’t get the main idea.