When I packaged more, I used Konqueror..
I generally use KDE and I like that I can split the window/tab into more panes (I usually open the Sources, SPECS, SRPMS, and RPMSS Folders in the same tab, and have additional tabs for Dropbox, ibiblio, rpmbone, sftp, etc; now in KDE4.4 you can also combine synaptic in to the mix!)