Using PdfLatex in OS X? This thread here mentions MacTex but it is 2 GB in size and I am trying to find something as small as Apple's open command for modularized preview. How can I get something like pdflatex in OS X? Something like open-style modularized create for OS X?
Try BasicTeX which includes pdflatex and all the usual tools, but is only 64M.

For a description of what it contains, see BasicTeX.pdf.