As I'm the maintainer of obvious, I should probably suggest its popup_run item which basically does what you want. I myself use dmenu with uzbl though because I have a neat shell script around which caches entries made, thus serving as a history/bookmark/url box.
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GCS/IT/M d- s+:- a-- C++ UL+++ US UB++ P+++ L+++ E--- W+ N+ o--
K- w--- ?O M-- ?V PS++ PE- Y++ PGP+++ t+ 5 X+ R tv b+++ DI+++
D+++ G+ e h! r y+
Gregor Best
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