Cognitive Procesing of Hyperdocuments: When Does Nonlinearity Help?
Cognitive Procesing of Hyperdocuments: When Does Nonlinearity Help? 
This review article combines the information of serveral studies concerning the advantages of hypertext over linear text. The main uses are general reading, learning and information retrieval. It turns out that there is "...no consistent evidence for the advantage of hypertext over linear presentation formats."
Very good review. Lots of studies are included, but there is still enough information to show what's going on. Also, the text is well structured.
There is quite some information in this article. Some overview or summary tables would have been useful.
Is hypertext useful for information retrieval? Why?
What is cognitive monitoring? Why is it important?