You can opt to see relevant posts in date order, which should help ensure you're looking at the latest information. Don't forgot to read the comments too, if there are any, as these my provide further information and updates.
You can also use the 'search this blog' facility and look for 'guidelines' or anything else you're interested in.
Alternatively, find any post mentioning the magazine (or subject) you're interested in and click on the link below the post. That will bring up all posts with the same tag.
You may also find the guidelines database useful, as that has brief details for each magazine, plus useful links.