[Svnmerge] Is there a GUI for svnmerge?

[Paul Walmsley]

I've started using subversion and svnmerge quite recently, and found it 
very useful.  When attempting selective merges of long branches I find 
it unwieldy to filter the changes I want to merge or block.  Currently I 
have to do it in batches which becomes quite time-consuming and 
error-prone. 

So, I wonder has anyone put together any kind of UI for svnmerge which 
lets you select changes for merging or blocking?

thanks
Paul