I think I can get to your file, but it looks like there's nothing in it to get?
I think you should place some text into the file..."262sc8ss8a.txt" would be a good start.
Other than that, DNS looks correct and HE knows about it
[carl@mars ~]$ dig aaaa ewanm89.co.uk @ns2.he.net
; <<>> DiG 9.6.2-P2 <<>> aaaa ewanm89.co.uk @ns2.he.net
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 58294
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; WARNING: recursion requested but not available
;; QUESTION SECTION:
;ewanm89.co.uk. IN AAAA
;; ANSWER SECTION:
ewanm89.co.uk. 86400 IN AAAA 2a01:7b8:2000:26::1
;; Query time: 112 msec
;; SERVER: 2001:470:200::2#53(2001:470:200::2)
;; WHEN: Tue Dec 21 09:14:08 2010
;; MSG SIZE rcvd: 59
Oh, this is interesting
[carl@mars ~]$ wget http://ewanm89.co.uk/262sc8ss8a.txt
--2010-12-21 09:15:02-- http://ewanm89.co.uk/262sc8ss8a.txt
Resolving ewanm89.co.uk... 2a01:7b8:2000:26::1, 95.172.5.58
Connecting to ewanm89.co.uk|2a01:7b8:2000:26::1|:80... failed: Connection refused.
Connecting to ewanm89.co.uk|95.172.5.58|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 0 [text/plain]
Saving to: `262sc8ss8a.txt.1'
[ <=> ] 0 --.-K/s in 0s
2010-12-21 09:15:03 (0.00 B/s) - `262sc8ss8a.txt.1' saved [0/0]
I can get your file over IPv4, but not IPv6