Initially lot of people in Dhaka reported these problems and they thought it might be some server problems.
I checked accessibility of particular site in different country using Looking Glass services and found everywhere they are working nicely. In Bangladesh only such service is hosted by Bangladesh Linux User Group. I took 3 sites: Youtube.com, eSnips.com and Google.com. I tried to do Traceroute and found
It shows all Youtube packets stops at GW-TELNET.BTTB.GOV.BD . Mango and BTCL (formerly BTTB) are the official IIGs (International Internet Gateway) in Bangladesh.
Same for eSnips.com. It does not go beyond BTTB router
Now you can see Google request is reaching the server without any problem.
If Bangladesh Govt thinks Internet is like Cellphone service then they are living in fools' paradise. There are many ways people can bypass the blockage. Earlier they tried to block Blog sites by blocking TCP ports in firewall but people redirected ports and made them working. In this particular case anyone can use Anonymous proxy and bypass firewall! Interestingly, many of my friends told that they could watch Youtube because Govt has no control over VSAT based connections.
Youtube, eSnips etc are very common and useful services. If Bangladesh Govt authority think any particular Audio and Video harmful for our society they could directly request Youtube to remove them. Such wild blockage is not only stupidity but also raises question about Govt's intention.
I wish Bangladesh Govt understand the situation and remove any kind of blockage to these sites.
Update on March 9, 2009:
BTRC Chairman confirms Ban of these sites. More..
Thanks to Rezwan of 3rd World view to refer this site.
Mehdi published a list of few other blocked sites.
If you don't like to install software use Ad based https proxy: https://www.vtunnel.com/