Since I was tired of using my old torrent client, and I absolutely despise it when new releases come out and there is no rss support. (No offense to the deluge team. They're doing a great job, and I'd prefer they handle the bigger bugs first.) So, I've hacked together a new version of flexRSS for the 1.x series so that we don't have to wait for 1.2+ of deluge (like some other torrent client I know) for an rss feed plugin. So, if you feel daring, go ahead an give it a try.
This is in no way a substitution for any officially released version that may come out, since all I really wanted to do was hack around in python a bit. (First time.) This is more or less a direct port, so the code is a bit ugly and many of the fancy new features in the 1.x api for plugins are not taken advantage of. So, if anyone is working on this plugin (or similar), feel free to continue, take a gander at what I did to port it for ideas, or whatever.
Typical dislaimer: All copyrights held by their respected, original copyright holders, provided as is, no warranties of any kind, freely redistributable using GPL, etc., etc. You get the idea.
Warnings:
-I've only tested this under sabayon (linux) x86_64 with py2.5 on 1.0RC8, svn (rev3038), official 1.0 (for about 6 hrs. and counting... so far svn 3038 has been the most stable for me)
-Haven't really tested the cookies feature, since I never use them, but I know they're saved and loaded appropriately. The rest should be transparent between versions, so they should work just like they did in the older release.
Some notes on changes/features different from the official .5x series flexRSS plugin:
-support for the 1.x api

-config tab is now in the general preferences section
-new history tab (wip) - currently only provides a history for generic-type filter matches that have successfully been added to deluge
-open url option added to feeds section's right-click menu (useful for feeds that sometimes reference websites instead of a torrent link)
-there is a webui, but there's currently nothing there; I don't use this feature, so it may never happen unless I'm/someone else's inclined otherwise to add it
known issues/limitations:
-flexrss config files from the .5x series have been known to cause issues; the typical issue is that the plugin will not load at all with them in your config directory. Removing these files from your deluge config directory (ex. ~/.config/deluge/flex*) is currently the only solution. (As an extra precaution, you could back them up just in case you ever need them again.)
-in filters, 'Insert torrent at top of queue' doesn't work (limitation as of svn 3830 / too lazy to implement a cb, since it adds complexity for something so simple)
-if you try to download a torrent from the flexRSS ui and adding the torrent fails, there's no real feedback unless you started deluge from cli and are watching the cli for messages (check to see if it is a valid torrent file using the new open url option)
-filtering doesn't exactly work as expected* (It should work exactly the same as the previous version, but has this really ever worked correctly? No, seriously, has it?

*suggestion for the last entry: if you have any non-alphanumeric character in what you want to match, use a '.*' instead of some other, more 'accurate' regex convention (like escapes).
To install on linux, put the attached egg file in your /usr/lib/python2.*/site-packages/deluge-*/deluge/plugins folder (make sure you have permissions)
To install on windows... I don't know.

If you remove it, be sure to disable the plugin before removing. (In v1.0, deluge would crash on me if it wasn't there and it was enabled. Didn't really test the rest.)