Is it possible to use a webpart, f.x. a list of news on all sites, f.x. in a right column?
The webpart will only be created once and then "copied" to all other sub-/sites.?
You can add content query web part to your page which is easy to configure and after finishing your configuration you can export the web part and import it to whatever page
since you will use this approach. you can also check the following webpart http://imtech.codeplex.com which is an extended version of the content query web part that support built in server side paging
Yes it is possible..
you have to create custom webpart using visual studio..
go through below link.
Hope it helps...