http://www.testmagic.com/Knowledge_Base/TOEFL/Reading/ pen and paper vocabulary, grammar and comprehension tests all based around one reading--one text only
http://www.4tests.com/exams/examdetail.asp?eid=57 interactive online test, including reading --one text only
http://www.toeflprepinfo.com/toefl_reading_comprehension1.htm 1 text only
http://www.manythings.org/voa/ a test based on rational cloze
http://www.longman.com/ae/marketing/sfesl/practicereading.html grade school text+questions, easy, but still practice
http://www.tea.state.tx.us/student.assessment/resources/online/2003/grade5/read.htm grade5 as it says, a number of text+questions—just alter the number in the url—they go up to grade 11, then “exit”. Also try 2002. Wonderful question types!
http://mindbluff.com/askread.htm --speed reading test
Reading only
http://www.msnbc.msn.com/id/3032542/site/newsweek/ Newsweek magazine
http://www.time.com/time/ Time magazine
http://www.bartleby.com/65/ Columbia Encyclopedia
http://en.wikipedia.org/wiki/Main_Page The free, collaborative web encyclopedia
http://www.bits.westhost.com/interact/sets/index.htm all sorts of stuff including film scripts
http://esl.about.com/library/quiz/bltoefl4.htm various vocabulary and reading tests
http://www.quia.com/custom/1527gate.html a matching card game
http://esl-lab.com/vocab/index.htm
Vocabulary lists, concordancers
http://www.learn4good.com/languages/spec_english_toefl.htm links to useful lists of affixes and roots
http://www.edict.com.hk/concordance/WWWConcappE.htm a nice easy concordancer with a choice of corpora
http://filebox.vt.edu/users/elbowles/TOEFLPrep/toefl_reading_material.htm I have extracted the most useful (and working) links from this page in the list above