Letterland do some brilliant flashcards, but be prepared to be bored out of your skull by endless requests to look at the cards. Or is it just me who has a toddler obsessed with anything at all on cards?
FWIW, DD1 is in reception and I got told off slightly by the teacher for not teaching her the letter names alongside the phonics. Obviously she knew some of them, but I had concentrated on the phonics sound and she could read a tiny bit (ie sounding out) but the teacher preferred them to know the name and the sound.
OOH, I forgot - alphablocks. Look on the cbeebies website. I remember DD1 loving that at about 2 and a half, and she kind of absorbed the phonics, iyswim. Then reading eggs when she can use a mouse.
The alphabet song is fun too, but doesn't really help much tbh, until they get on to alphabetical order.
Use different ways of learning, and use the order that is suggested on phonics schemes - it starts S, A, T, P, N, I if I remember correctly. Chalks on the patio, tracing the letter with her finger in sand, playdough, shouting, whispering, pointing the letter out, pretending to be snakes, eating apples, having a dolls tea party etc.
Jolly phonics do a CD which I was underwhelmed by, but school use it.
I bought a book called the ordinary parents guide to teaching reading but found it a bit boring.
DD1 is now a fluent reader, so either we did something right, or she is naturally clever and has overcome having a mum who had no idea what to do :) She kind of went from knowing the odd letter to sounding words out in a sudden jump, then stayed at sounding out until she did another sudden jump to being fluent. I have no idea why, but don't panic if they lose interest for a bit - it is just the way that kids minds work.