From the official <A HREF="http://www.catinthehatmovie.com/">Dr Seuss' The Cat In The Hat </A>website, here are QuickTime links to four TV spots and seven clips ..

<A HREF="http://www.thecatinthehat.com/video/cith_tvspot_1540_700k.mov">Dr Seuss’ The Cat In The Hat – TV Spot #1 ‘Into A World’ (1.7MB)</A>
<A HREF="http://www.thecatinthehat.com/video/cith_tvspot_1560_700k.mov">Dr Seuss’ The Cat In The Hat – TV Spot #2 ‘Thing Or Two’ (1.6MB)</A>
<A HREF="http://www.thecatinthehat.com/video/cith_tvspot_3160_700k.mov">Dr Seuss’ The Cat In The Hat – TV Spot #3 ‘Ultimate Cat’ (3.3MB)</A>
<A HREF="http://www.thecatinthehat.com/video/cith_tvspot_3180_700k.mov">Dr Seuss’ The Cat In The Hat – TV Spot #4 ‘Party Animal’ (3.5MB)</A>

<A HREF="http://www.thecatinthehat.com/video/cith_tv_get_back_700k.mov">Dr Seuss’ The Cat In The Hat – Clip #1 ‘Back To My Kids’ (5.5MB)</A>
<A HREF="http://www.thecatinthehat.com/video/cith_tv_scream_run_700k.mov">Dr Seuss’ The Cat In The Hat – Clip #2 ‘Scream And Run’ (6.5MB)</A>
<A HREF="http://www.thecatinthehat.com/video/cith_tv_talking_fish_700k.mov">Dr Seuss’ The Cat In The Hat – Clip #3 ‘The Fish Is Talking’ (2.7MB)</A>
<A HREF="http://www.thecatinthehat.com/video/cith_tv_cat_here_700k.mov">Dr Seuss’ The Cat In The Hat – Clip #4 ‘Is There A Cat In Here?’ (9.6MB)</A>
<A HREF="http://www.thecatinthehat.com/video/cith_tv_kupkake_700k.mov">Dr Seuss’ The Cat In The Hat – Clip #5 ‘Kupcake-inator’ (12.8MB)</A>
<A HREF="http://www.thecatinthehat.com/video/cith_tv_wrecking_700k.mov">Dr Seuss’ The Cat In The Hat – Clip #6 ‘Wrecking The Whole House’ (4.8MB)</A>
<A HREF="http://www.thecatinthehat.com/video/cith_tv_slow_700k.mov">Dr Seuss’ The Cat In The Hat – Clip #7 ‘Nothing Faster Than S.L.O.W.’ (4.8MB)</A>

You can find links to a music video and a featurette <A HREF="http://www.movie-list.com/forum/showthread.php?s=&threadid=7813&highlight=%2Acat+in+the+hat%2A">here</A>.