Would be nice to get 7-PDF Split And Merge on portableapps.com, I think?!
I like the easy to use app-interface and program features to split and merge pdf-files instead of using the cryptic PDFTK Portable. The freeware version could be the right for many other portableapp-users for private purposes...
You can find the this nice portable app at: http://www.7-pdf.de/7-pdf-split-merge/description/