I have just made one. Hopefully it will function as you/we like it.
It has also the RSS capability so if you use an RSS aggregator software (like I do) you can get all posts to your reader. It also has the possibility to only watch some of the topics (separate RSS feeds).
The address is http://looneylabs.forumsline.com/
, please register and try out. It is of course Unofficial (as also written in its headers) so dont affiliate it with LooneyLabs in any way.