I just passed the test (first time) on Friday. However, I was somewhat unhappy with my overall score of 659 (I really thought I was better prepared).
I'm certainly no expert, but I think I can suggest a few pointers for others on passing the test the first time (these were already mentioned in the forums but I just didn't pay very close attention to them):
Follow the objectives from CompTIA and
stay on topic! There are several online practice exams that I kept scoring low on because they present questions that are networking in nature but are not covered by the Net+ exam. I wasted huge amounts of time trying to learn about and memorize everything that I came across. I think the time I wasted on subjects that weren't on the exam was the major reason for my low score.
Definately use more than one source for study. I bought the Sybex Network+ 4th edition which is excellent, but even that had gaps in the information. I also used the TechExams pdf which helped out on several questions for me. Also, keep reading the forums- I realized during the exam that they're full of VERY useful information about the specific exam, as well as general information on the exam environment.
Make sure you know the easy stuff (OSI model details, ports, cable specs) backwards and forwards. Literally- use flashcards if you have to (like I did) and know the specs from the topic and the topic from the specs. If you have that level of knwoledge over the easy stuff, you've got half the test in the bag already.
Finally, do take advantage of the online practice exams that are out there- just don't get too worked up over questions that aren't covered by the exam objectives. The practice tests on TechExams were right on point, as were those on mcmcse.com. ProProfs.com exams were the chief source of my frustration, however. Out of the 250+ questions on their site maybe 15% were completely unrelated.
If you pay attention to the objectives you won't see any big surprises- any questions that seem to come out of left field are probably of the "ungraded" category.
I hope this helps someone who is about to take the test-
good luck!