"Imp_list" is the abbreviation you see in the subject-line of an e-mail message from Imp_list"at"yahoogroups.com, a once fairly active e-mail list, which is the discussion forum for http://thedailyimperialist.net/, the Daily Imperialist website.
By September 2014, the Daily Imperialist seems to have hibernated. The above link redirects to http://metropolisink.com/, which once had, but no longer has, a page for it. Good news is that this wiki is likely to persist indefinitely with its free hosting on a growing wikifarm!
- Information page - accessed October 2014