For my project I would like to export only the changed/added files since last update (those marked with red exclamation or plus sign) using tortoise svn, however I can't seem to find the right combination to do this simple task.
What I do now is do xcopy with specified modified date, however it misses some files which were simply added to a folder and not modified. Since I can get a list of changes, I don't see any way to simply export these files to a deploy directory.
That's not a built-in feature of Tortoise. You could probably whip up a script in powershell that would parse the output of 'svn st' and copy the files though.
Your best bet might be to use svn status, then grep on the file codes to determine what files to copy.
Check-for-modifications dialog, sort by status. Shift-Click or Ctrl-Click to select all those with "modified" and "added" status. Then simply right-drag the files from the Check-for-modifications dialog to another folder in explorer.
Another way (if you already committed your changes): Show log dialog, select all revisions with the interesting changes. In the lower pane, shift-select all entries, right-click, choose "save as".
Yet another way: Use the repository browser, find the first url (assuming you want to export everything that's changed between two tags, e.g., version 1 and version 2), right-click, "Mark for comparison". Find the second url, right-click, "compare urls". In the following "changed files" dialog, select all files, right-click, choose "export selection to...".