I like the thoughtful way you note that you judt recieved 8 fry from the guppies. They gave you the gift. It is easy to brag, "I bred those fish." Actually they did all the work! ;)

That is a terrifically important question Josh, about unhatched eggs. Maybe take a rag (old t-shirts never die...) or a piece of paper towel and run it around the edge of the tank, where surface tension would lifted many of the eggs shells.

If you are hatching b.s. eggs in a jar, remove your air source - a piece of hard airline tubing will clog less than an airstone. Let the water settle. A lot of the eggs will either float or settle to the bottom. Putting a reading lamp near the container will cause many of the shrimp nauplii to gather near the light and they can be more easily siphoned gradually through a sieve,  b.s. net, strong paper towel (I'd leave it in a net for support) or a soap-less handkerchief.

Rinse lightly, drop into a jar of seasoned water and use a turkey baster to feed them as needed. Adult guppies will enthusiastically eat any extra baby b.s.

By the way, brine shrimp egg sellers will also sell decapsulated eggs in a dry form. After  hydrating (adding water to) a few of them (tap water is ok, distilled or RO water is best) they can be fed to many fry. If you hydrate too many of them, you can make up a super saturated salt solution, put the hydrated (wet) decapsulated eggs in the salt solution and store them for a few days in the refrigerator.

Those eggs which are sold that way often had a poor hatch rate and so the companies decapsulated them. Ironically, because the shrimp don't hatch and begin using up the nutrients (especially HUFAs) the decapsulated eggs are actually more nutritious than the baby brine shrimp!!!

And here's more good news! The decapsulated eggs are a lot cheaper (or less expensive) than
regular B.S. eggs!

Since guppies are grazers, some will take those still eggs right away. Other people will hatch a few live baby b.s. and after a few feedings, they will drop a few of those hydrated eggs in with the baby b.s.  Most fry can be conditioned to take the decap eggs.

Wayyy back when I went to a local shop and the little old lady (well anybody over 40 had one foot in the grave when I was in Junior High) who ran that shop put a few unhatched b.s. eggs in the guppy tank and claimed the guppies ate them.  Puzzled, I went home and looked that up in a book and concluded that she was really wrong! So much for always trusting somebody over 30. Her guppies survived because of the other food they ate (which probably pushed the few b.s. cysts through their system.)

I used to hatch them in one of my Mom's Pyrex glass baking pans. No aeration. They would be sort of harvested in the mornings when the b.s. followed the sun to one side of the baking pan. I'm amazed now that residual soap didn't kill either the shrimp or guppies!

By the way, here's an article on fry foods. It includes using egg yoke, which was asked about recently by momof2 in her very comprehensive "what kind of veggies" question :

http://www.fishinthe.net/html/section-viewarticle-17.html
Fry foods

The next article below was a 50 year retrospective on the hobby which must have been written 15-20 years ago, because this guy was doing things we wouldn't have much chance of doing in the late 50s, early 60s.

In light of Peter's query, I found it interesting that they collected "winter Daphnia" which were really Cyclops. Of course they had to chop through a couple of inches of ice to get them. (Doesn't hatching b.b.s. sound good now!)

http://www.gpas.org/articles/50years.htm

And here's a convenient way to hatch b.b.s.  I guess the hatching containers brought back memories. ;)  They do offer a lot of surface area. Many of us use gallon pickle jars these days.

http://billismad.tripod.com/id6.html

If you Google for Hatching Brine Shrimp Eggs you can be busy for hours just reading all of the suggestions! So I have thoughtfully selected a couple of good articles to save you a little time. ;)