Is there a catalogue of new seedlings - if not should we start one?

as a newbie to veg growing, it struck me quite early on, how do I know whats growing in my cells is the seed I planted and not some weed coming up. Waiting was the only thing I could do before I knew for certain.

It would have been (and still would be) helpful to have some well illustrated manual with photos of the various seedlings at say three stages of development to refer to, both to know what you're looking at and that its healthy too.

Does anybody know if a good manual exists, and if not would it be a good idea for this site to introduce a seedling photo gallery? What do you reckon John?

as a newbie to veg growing, it struck me quite early on, how do I know whats growing in my cells is the seed I planted and not some weed coming up. Waiting was the only thing I could do before I knew for certain.

It would have been (and still would be) helpful to have some well illustrated manual with photos of the various seedlings at say three stages of development to refer to, both to know what you're looking at and that its healthy too.

Does anybody know if a good manual exists, and if not would it be a good idea for this site to introduce a seedling photo gallery? What do you reckon John?

There are some excellent websites - especially weeds - to refer to, you just have to look - try Bayer for starters:
http://www.bayercropscience.co.uk/content.weedspotter/1036/1040/e-Tools/Weedspotter/Broad-leaved%20weeds.mspx?fn=fullbroad
But basically, is you are growing several cells of something and one thing comes up that doesn't look like the others its probably a weed!  Experience will educate you, don't worry, that's the fun of growing. Fumitory is one of the most confusing weeds, it's a prolific self seeder and looks like a carrot/larkspur/love-in-the-mist but if you are using fresh potting compost you are unlikely to have problems
Oliver

My seed packets all have a picture of the seedling on the back.

Think developing our own resource would be time-consuming, never-ending and many seeds have now been sown and growing away so too late.

Type the name of any plant into google images and it will show pictures. e.g type in spinach seedling and there are 38,000 pictures of it to browse through.