Perhaps if you yourself are not in the UK then that's why you ask, as I guess foreigners would need to more specifically try harder to keep up to date with our politics than we do here (even with my loose following of current afairs, the papers I read are written with a UK focus, the topical news quizzes I watch on TV are UK focused, etc.)
Having said that, if people are interested in the day to day then the Guardian do a live politics blog most days which will have coverage of speeches, important votes and links to articles and comment pieces in the other papers.
Also if you are a UK citizen and care about politics I think it really is worth your time to actually sit and watch parliament at some point. Preferably try and work out when they will be talking about an issue you care about or have an interest in (I'd advise against Prime Ministers Questions, it's mostly a lot of pre-prepared soundbites and weak jokes with very little answering of questions). It will probably reveal quite a bit about the real positions of backbenchers, the main parties etc beyond what you see in the papers or the soundbites on the TV news. You may find it surprising who you are agreeing with or not. Also there is a lot of theatre and protocol to it which is kind of entertaining at times.
Also, I've found comedic sources can be great. My two are Have I Got News For You (Friday night comedy panel show based around current afairs - doesn't run all year round though) and Private Eye (satirical current afairs weekly magazine - coincidentally edited by one of the permanent team captains on HIGNFY, Ian Hislop). They can be great fun if you know what they are going to cover already, and they can be a great way for people who are less interested, or just less up-to-date, to get a snapshot of news without having to try too hard to get into it.