In recent build of Emacs trunk, the frame of Speedbar looks too large: 
its width is >= to that of Emacs frame (usually 80x40), see the attachment.

Is this to be expected?

Is there a way to call Speedbar in the same Emacs window, not in new 
frame? If not this should be added... Emacs would appear similar to 
other modern IDE... But, perhaps, the best solution would be to add ECB 
in Emacs likewise CEDET was added...[*]

Ciao,
Angelo.

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[*] Interesting is this long thread:
http://lists.gnu.org/archive/html/emacs-devel/2010-07/msg00310.html