TwinkleToes,
If what you're looking for is just occassional edutainment, you should check out
http://www.bbc.co.uk/schools/The frustrating thing is you might have to sift through materials to find out what is appropriate for her personality, interests, and abilities... but at least it's free. I haven't played around with it much, but
http://www.bbc.co.uk/schools/ks2bitesize/science/ seems like it will work well for my dd (who will turn 4 in July).
That being said, I have been using T4L for about 3 weeks now and have figured out how to do it in a way that makes sense for us. No quizzes or tests, except the ones at the end of the math sections that are required for the lesson to be considered "complete". No going in order unless we feel like it. No comprehension stuff -- it's superficial, multiple-choice, anyway. DD isn't doing the phonics stuff, but she's ~ 2/3 through Math 1; after burning through Science 1 and 2, she's doing the games on Science 3 (which is mostly text, so we just look through til we find a "game" -- or interactive lesson; and, so far, yes, the Grade 3 games still seem simple and slow). She's almost done with Social Studies 2, and will be soon be doing the same thing with Social Studies 3, and we're picking and choosing our way through LAs 1-3 based on what sounds interesting (she's gone through all the LA Extention 1-2 stories (which I think are awful, but she goes through so many books that I can't fault her these few more stories) and last night we did a neat family tree section on LA 3).
Basically, I let her do as much as she wants (or occasionally less) of what she wants (though if she begins something, she needs to finish it, unless it's clear to me that it's not developmentally appropriate at this time). I'm not sure if I'll keep the subscription past this month, and if I do, I doubt I'll keep it more than two months total. By then, she'll have exhausted most of the non-textbook type stuff, and if she's going to be looking at books, I figure it might as well be offline. But she's enjoying the math portion, because it's big on stuff like patterns, geometry, and measurement, which she really enjoys -- and which I just haven't found a cool alternative for, so that's worth it for me. The science, social studies, and LA she enjoys, too, but it's definitely replaceable. And, yes, I find the little lessons repetitious and boring -- and sometimes it seems like the easier it is, the more repeating there is-- but dd doesn't mind, so there you go.
One downside is I feel like since I'm paying for this, I should let her take as much advantage as she wants to; T4L has significantly increased her computer time -- but decreased her tv time, so maybe it balances out in the end?
(My dd could zoom ahead *almost* like that, but I'm worried about letting her get too far ahead in science, b/c eventually she'll need math skills for it? Or perhaps needing the math will make learning it more appealing? I dunno...) 