Oh yeah probably the best method. I use something called "teachers gum" but it actually sucks because it is elastic and posters do get a little spoiled, so does the wall.
That would be the best method, yes, a shame my housing company prohibits from making holes on the wall.
Hence why I haven't put some neat Soviet, Israeli, etc. posters on my walls since I don't want to ruin them with blu-tack. All the posters I've put up with it start tearing up from the corners and stuff.
