Hi.  There is an old bossa nova song called Aguas de Marco by Jobim. 
I'm looking for one of two versions (preferably both).  The one I
really want has Jobim, Chico Buarque and Caetano Veloso.  The other
one has Marisa Monte and Jobim, I believe.  I don't know if the two
versions are the same, but they sound awfully similar.  Its the
version where around the 3.10 minute mark you can hear the female
singer's voice get really throaty and here her try and stifle a little
laughter.  I'd like to know which albums these songs are on and where
I might buy them if they are not available on Amazon.  It's also the
version featured on the Sealab 2021 episode entitled Marco's Return
and is featured on one of the commercials for Adult Swim.

http://www.amazon.com/exec/obidos/tg/detail/-/B000001FCB/qid=1106832070/sr=8-1/ref=sr_8_xs_ap_i1_xgl15/103-8872826-7838230?v=glance&s=music&n=507846

Hello,
The link in the comment above is a CD in which Elis Regina and Tom
Jobim sing Águas de Março.
The two links below are from a CD in which Buarque, Veloso and Jobim sing the song:
http://somlivre.globo.com/Produtocd.asp?pub_int=1793&ProductID=001237

http://www.amazon.com/exec/obidos/tg/detail/-/B0000281LU/qid=1106832362/sr=8-2/ref=sr_8_xs_ap_i2_xgl15/103-8872826-7838230?v=glance&s=music&n=507846

The particular Sealab version of Aguas de Marco (Waters of March) can
definitely be found on Antonio Carlos Jobim's 'Personalidade'
compilation (best of) CD that was released in 1987 (featuring Elis
Regina):

http://www.allmusic.com/cg/amg.dll?p=amg&token=ADFEAEE4721FDC4AAE7620CA9D324BDBB170E008DD48EA870E255975D4BA25458C047AAF5FFA8481E8BC06D33BD58B47E85810D2D5EC56FCD92A3C3F87EDA66A3B365B6675&sql=10:b998b5p4bsq4

I'm not positive on where to find this other version you are looking
for, but look for 'Personalidade' for the Brazilian music mastermind.

O parceiro mais importante de Tom Jobim, depois de Vinicius de Moraes
(com quem escreveu "Garota de Ipanema"), foi Chico Buarque. A parceria
Jobim - Buarque é comentada no texto "Tom e Chico", em
http://www.brasileirinho.mus.br/artigos/tomechico.htm.