The easiest way to locate the folder is to start a remote edit then in TextMate cmd-click on the window title - a path menu will be shown. Select Cleanup At Startup folder, then you'll see all the Edit folders.
Someone asked me if this was still working in v1.8.2
I verified that it does still work. The confusion was that you need to select the 'servernamehere' Edits folder, not the Clean Up At Startup folder itself. The Edits folders are inside that folder. This is already stated elsewhere in the thread, but it's a long thread so hard to see... so here are the steps required in one post:
1. In Yummy set TextMate up as the default editor. See Preferences -> Server Options. Then connect to your server then select to Edit one of your files.
2. When the file opens in TextMate CMD-click on the document title and select Cleanup At Startup. This will cause the Finder to display the contents of the Cleanup At Startup folder, which we will need later.
3. In TextMate, close the document then create a New Project. Click on the cog icon in the project drawer and select Add Existing Files. When the file picker displays, drag the youservername Edits folder from the Cleanup At Start folder displayed in the Finder onto the file picker window, then click Open.
4. In TextMate, click the (i) icon at the bottom right of the project drawer and clear out the 'folder pattern' field shown in the resulting window, then close it.
5. In TextMate, close the project drawer then select to Save Project and give it a meaningful name.
6. In Yummy, select to edit a document on your server. Voila! It opens in a project tab.
From now on, if you open the saved TextMate project before starting any edits with Yummy, your editing will be in tabs in the project window.