Not that I'm aware of.  Depending on what it is you're looking to display you could use rss to grab elgg content and display it on another site.  If it's content that is not public I have a plugin that allows for authenticated rss.  It's not an elgg widget on the other site, but it could be styled like one.

@Matt thanks for your response

To elaborate on some of what Cash said:

• A beta for 1.8 is scheduled for the middle/end of autumn.  This can change.
• For non-theme plugins, the biggest change will be the layouts used in elgg_view_layout().  So far it's as simple as as changing a string and swapping the order of the arguments passed.
• I'm considering writing a compatibility wrapper "theme" for 1.7 plugins whose authors choose not to upgrade them.  Since non-theme plugins are generally easy to update and this will take significant time away from actually developing and testing 1.8, it might not be worth it.
• Don't use 1.8 for production.  Don't use anything in SVN for production.

Thanks guys!

THX to Brett and Cash ... you guys doing a good job .. and hope you will push elgg in a new sphere with 1.8 ... if you need some ideas ask me or check my featurerefquests in this forum ;-)