@Otto - I checked detailed list of component and blogger-importer is missing from the component list.
I manually added this component in drop-down list using firebug (thinking it might be UI glitch) but I still got warning on submission.
May be core wordpress import/export tools, were added differently to plugin repo so "trac" has no "track of them". Or may be just only moderators or automattic members can work on them.
I hope you will figure it out. :-)

Off-topic - On http://wordpress.org/extend/plugins/ we have link to add new forum topics. Can you add a direct link to add new "trac" ticket. Will help IMHO.