I made a packet of 9 treble clef cards for each student. These are each ½ an index card. On each card is a different note of the treble clef on the staff. No notes are above or below the staff. At the first lesson, I have them memorize a sentence to help them remember the names of the lines (from bottom to top): Every Good Boy Deserves Fudge. You may know a different one, but any sentence in which the words start with EGBDF will be fine. The spaces spell FACE. Space rhymes with Face, so that's the connection. The student pencils the note name on the back of each card, so at home, it can easily be self-checked. Make sure it's not able to be read from the front of the card! Repeating the sentence ( Every Good Boy Deserves Fudge) will help keep it fresh in memory.
The ultimate goal is for the student to be able to flip through the mixed packet of 9 cards twice in 30 seconds which can be mastered in a short time, saying the note name of each correctly before putting it in the discard pile. The first goal may be once through in 30 seconds. Some students like trying to “beat the clock”; for others, it makes them more tense. I say, if it helps, do it, if not, delay the timing aspect until the student wants to and will likely succeed in reaching that goal.
The notes which are included in a purchased pack of flash cards is usually much greater, but the ones which must be learned first are easily sorted out. If you wish to do so, laminating each card is most useful, since the cards will quickly get dirty and bent, if I know anything about kids and cards. Check your local music store for flash card sets.
http://library.thinkquest.org/15413/theory/note-reading.htm is a site to which is a good reference page.