I'm speculating here, but i guess T-zone chose these is because they cost nothing and they are ad free.
To be fair to Freeforums, they have only been going a few months and i think demand has outstriped bandwidth, hence the problems last weekend, and for most of this week. They were trying to set up some new servers but it went a bit pear shaped.
The forums are going down again at 9pm PST, or 5am BST, they say it is going to be offline for 30mins to 1 hour

, i wouldn't hold your breath though. Here is the link to there post:
http://forum.freeforums.org/viewtopic.php?t=7143
[EDIT] Perhaps one of the Amins/Mods would put this infomation in the Forums Infomatiion section, so everyone can see it
