Can't connect to a some sites

since a couple of days I can not reach some sites. examples are:
http://www.brushesapp.com/
http://tweepsapp.com/
all internet connections are just fine, there are just a very few sites i can't reach. but i can reach them with gprs on my iphone so i know the problem is with 'me'.
setup: speedtouch modem connected to airport extended network (airport extreme/airport express
os: mac 10.6.2
systems: powerbook pro and mac pro, iphone, wii, ps3
i rebooted all modems and still no go, also when i disable wifi and use ethernet, i have no access to the above sites.
could it be a problem with my provider ? any guesses here ?
many, many thanks as this is a great mistery to me !

glenn, thx for all your help. excuses for my late reply as i was on travelling !
i added the 2 dns numbers and they gave me access right away to the websites i couldn't access before so everything seems to be fine untill i found out that i had no access (authorization) to my personal twitter account. (all family members did have access very well on the same network)
1) i checked with tweetie iphone on gprs and had excellent access. so was going on here. ? i first changed my twitter password but that did not help. then i was thinking on the dns changes.
2) i deleted the dns numbers from my airport extreme/express but kept them in my macs network prefs. this helped strangely having access to the earlier unaccessable websites AND my twitter account.
so problems solved but don't ask me if i understand it
do you recongnize this ?
cheers

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