For the original theme song, you can check out the most excellent CD from GNP Crescendo Records -

http://www.gnpcrescendo.com/

They have the theme song as a sample clip on their site (although I highly recommend buying the CD).
 

It's also on Drago's site (in WAV format) - http://www.geocities.com/Area51/Atlantis/7933/sound.htm

Scapers Sanctuary has it (with & without Crichton talking) - http://www.scaper.com/sounds/index.html

Don's World  http://www.the-spa.com/donsworld/ will also email it to you if you ask (last I knew).

Or ask in the binaries newsgroup - alt.binaries.tv.farscape  (if your ISP doesn't carry it, you can request it)
 

The words to the original opening are as follows (according to the CC on my "I, ET" DVD)

"My name is John Crichton, an astronaut ... a radiation wave hit and I got shot through a wormhole ... Now I'm lost in some distant part of the universe on a ship -- a living ship full of strange alien life-forms ... help me ... listen, please.  Is there anybody out there who can hear me?  I'm being hunted by an insane military commander ... doing everything I can ... I'm just looking for a way home."
 

The new theme song & opening scene for Season 3 can be found at DallasScaper's Farscape Fantasy site -
 

http://www.dallascaper.com/Theater5.html
 

To go directly to the downloads -

Quicktime format  - http://www.dallascaper.com/quicktime5/Credits_1c.mov

AVI format - http://www.dallascaper.com/video_scenes5/Credits_1c.avi

They're both about 2 meg.
 

Scapers Sanctuary also has the new opening in a WAV file - http://www.scaper.com/sounds/index.html
 

The words to the new theme song are as follows (according to the CC on "Season Of Death") - the phrases in parenthesis are the semi-whispered parts -

"My name is John Crichton (lost) an astronaut (shot through a wormhole) in some distant part of the universe (trying to stay alive) aboard this ship (this living ship) of escaped prisoners (my friends).  If you can hear me (beware), if I make it back (will they follow?), if I open the door (are you ready?) ... Earth is unprepared (helpless) for the nightmares I've seen ... or should I stay (protect my home) not show them (that you exist)?  But then you'll never know the wonders I have seen ... "
 
 

I haven't really poked around on the web much, but I know that Scapers Sanctuary has the Season four opening in a WAV file - http://www.scaper.com/sounds/index.html

The CC didn't work on my tape of "Crichton Kicks", so this is according to the CC on S4 Ep4, "Lava's a Many Splendored Thing":

"My name is John Crichton, an astronaut.  Three years ago, I got shot through a wormhole.  I'm in a distant part of the universe aboard this living ship of escaped prisoners -- my friends.  I've made enemies... powerful, dangerous.  Now all I want is to find a way home to warn earth.  Look upward and share the wonders I've seen."