Internet cafés abound in Bangkok. You'll generally be looking at rates of around 30-60 baht per hour in tourist-laden districts like Khao San Road, 20-30 baht per hour in downtown (the top floors of MBK for example), and 10-15 baht per hour if you would venture into residential areas (where the speed generally is still high).
An increasing number of cafés and pubs offer free Wi-Fi to their customers, including the ubiquitous Coffee World chain in all of its branches (ask for the password at the counter). TrueMove offers both free and paid Wi-Fi access. If you want to get online for free, you must register first, and both session and overall time is limited. Their network is accessible in many malls, including Siam Square, and sometimes can be available from your room if you stay in a nearby hot-spot — just look for the 'truewifi' network, you can register right there. Most hotels and guest houses provide at least some form of Internet. Some have Wi-Fi access inside the rooms — but inquire before booking.
There is not a lot of free Wi-Fi available in old districts like Rattanakosin or Yaowarat. Note that McDonald's and Starbucks do not provide free Wi-Fi. There's either no Wi-Fi at all or you'll have to pay for it.
The Most Frequently Asked Travel Questions about Bangkok
Where To Stay & Best Hotels in Bangkok - updated Oct 2023
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Bangkok Travel Guide from Wikitravel. Many thanks to all Wikitravel contributors. Text is available under Creative Commons Attribution-ShareAlike 3.0, images are available under various licenses, see each image for details.