Minor update because Club Sunday made a small change that broke downloading. "pcviewer_main.php" no longer goes directly to the viewer unless you add a "&vo=1" argument. And I thought that they caught on to me, phew. Anyways, I also changed the user agent of the downloader just in case.
I also finally remembered to make the downloader delete the temp files generated by Yahoo Comic and Club Sunday downloaders. You guys might want to check your temp folders for pcviewer_temp*.bin files.
Online Manga Downloader 0.0.4 (4SH)
As always, leave bug reports, suggestions, etc. in the comments or in the github repo.