I'm just about to edit my original post with some updates. Here's the marginally shorter summary:
New (since I last checked) additions:
Beck: Mongolian Chop Squad 1-24 Sub & Dub
Birdy the Mighty: Decode: 1-14 Sub, 1-4 Dub (under same page as 2nd series)
Blessing of the Campanella: 1-11 Sub
Hetalia: World Series: 1-24 Sub
Mushi-Shi: 1-4 Dub
School Rumble Extra Class: 1-2 Sub & Dub
Sekirei: Pure Engagement: 1-12 Sub
Tsubasa: Spring Thunder Chronicle: 1-2 Sub
Tsubasa: Toyko Revelations: 1-3 Sub
Removed or now not available:
Jing: King of Bandits: OVA 1-3 Sub
Soul Eater: 1-51 Sub, 1-4 Dub (I guess this should never have been available)
Amended (sub or dub episodes added):
Ah! My Goddess: Flights of Fancy: 1-19 Dub
Black Blood Brothers: 1-12 Sub, 1-2 Dub
Blue Gender: 1-13 Dub
Dance in the Vampire Bund: 1-13 Sub
Eden of the East: 1-11 Sub, 1-2 Dub
Galaxy Railways: 1-26 Dub
Hero Tales: 1-26 Sub
Heroic Age: 1-26 Sub, 1-19 Dub
Initial D First Stage: 1-26 Sub, 1-4 Dub
Initial D Fourth Stage: 1-24 Sub, 1-22 Dub
Initial D Second Stage: 1-14 Sub
Negima!: 1-26 Sub, 1-16 Dub
Okamisan: 1-11 Sub
Peach Girl: 1-7 Dub
Rumbling Hearts: 1-14 Sub, 1-8 Dub
Sekirei: 1-12 Sub, 1-2 Dub
Shuffle!: 1-24 Sub, 1-7 Dub
Suzuka: 1-19 Dub
The Legend of the Legendary Heroes: 1-14 Sub
XxxHOLiC: 1-24 Sub & Dub
Amended (sub or dub episodes removed):
Birdy the Mighty: Decode: 02: 1 & 3-12 Sub (now missing ep 2)
D. Gray Man: 1-6 Sub, 1-4 Dub
Darker Than Black: 1-26 Sub, 1-4 Dub
Fullmetal Alchemist: 1-51 Sub, 1-4 Dub
Jyu-Oh-Sei: 1-11 Sub, 1-2 Dub
MoonPhase: 1-26 Sub, 1-4 Dub
Murder Princess: 1-6 Sub
Negima!? Magister Negi Magi: 1-26 Sub, 1-4 Dub
Ouran High School Host Club: 1-26 Sub, 1-4 Dub
Sands of Destruction: 1-13 Sub
Save Me! Lollipop: 1-13 Sub, 1-2 Dub
Shigurui: Death Frenzy: 1-12 Sub, 1-2 Dub
The trend seems to be towards the YouTube rental side of things for the dubs, so any shows with subtitles and beyond four episodes of dubs now may have the dubs made rental-only (or region-locked) in future. I don't think UK users can rent them yet so that effectively locks them.
As always, I'd encourage you to buy any anime that you feel is worthy.