exporting .pdf files to other formats

[Ryan Mann]

Hello.  Is there any way in Leopard's version of Preview to  
convert .pdf files to other formats such as .rtf?  I thought there  
would be a way in the print dialog to print to another file, but I  
couldn't find anything.  I'm asking because I saved a school  
assignment as a .pdf, but I found out that I need to make some changes  
to it.  If I could convert it to an RTF file, I could edit it with  
Textedit.
Thanks.
Ryan