This is how I do it (I use the command line)
(1) Get the revision 3661when the branch was created as
svn log --verbose --stop-on-copy http://url/to/branch/3661
Take the smallest revision from the exit. Let's just say 911
(2) Reserve the last branch 2011-01-17and run it in the main directory. This will show all conflicts and updates, but will do nothing.
svn merge --dry-run -r 911:HEAD http://url/to/branch/3661
(3) If you are ok with the changes, do the actual merge
svn merge -r 911:HEAD http://url/to/branch/3661
. . .
(4) , ,
svn commit -m "Merged 3661 changes into 2011-01-17"
, . http://svnbook.red-bean.com/en/1.0/ch04s04.html
, SVN . - Subversion.