Tomoyo is definitely in love with Sakura. In the first
episode of the anime, before Sakura becomes the Card Captor
(and thus there's no way it could be a case of hero-worship on
Tomoyo's part), Tomoyo is constantly filming Sakura on her
camcorder, and there's this bit of dialog:
SAKURA: Why don't you film something more interesting than me,
Tomoyo?
TOMOYO: But there's nothing more interesting, or cuter, than YOU,
Sakura!
And Tomoyo says this while she has this dreamy look on her face;
seems fairly obvious to me that Tomoyo is madly in love with
Sakura. In the manga version, we have this bit of dialog:
TOMOYO: I really like a lot too, Sakura!
SAKURA: Me too!
TOMOYO: For sure, Sakura is thinking of a different
meaning of "like".
SAKURA: Did you say something?
TOMOYO: I'll tell you when you grow up a little more.
And then in a caption:
Tomoyo looked at Toya and blushed only because he reminded her of
Sakura.
And in both the anime and the manga, Tomoyo's most treasured
possession is a bunny eraser, the first thing that Sakura ever
gave to her.