Tabs provide one such paradigm. (For example, see article Classic System Solutions | Articles. Each block (i.e. a section) can be put in a DIV tab, and its visibility property can be mapped to the tab. (i.e. make it visible only when tab is clicked). )
If there are more than one dimensions, then usually tabs are not good. (See the above article for more information). You would use tabs for first dimension, and then some other scheme - say a series of links - for second dimension. I still like tabs for multiple dimensions (at least two dimensions!) - no one seems to have created a scheme I have in mind: Create the set of tabs arranged as series of rows; one behind the other. Let first column select the row first (i.e. it will change the row color). And then select column. Don't bring the selected tab (row/column) to the front line; it is highly unuseable. The mental models typically want information to be attached to spacial positions, and would want it to be as static as possible.
Whether we use tabs or whatever, I hope to see some designs based on the main theme: Allow multiple views on the same topic information, using standardized mechanisms that can be used by any wiki system.