Strange Text Web Pages
¿ǝƃɐd ʇxǝʇ uʍop-ǝpısdn ǝɥʇ ɹǝqɯǝɯǝɹ
Well, I recently found some similar pages. They all substitute unicode characters for the standard text; but since not all fonts have the full compliment of unicode characters, they may not display properly for everybody.
Go to bubbletext.org to see ⓨⓞⓤⓡ ⓣⓔⓧⓣ ⓒⓞⓝⓥⓔⓡⓣⓔⓓ ⓘⓝⓣⓞ Ⓑⓤⓑⓑⓛⓔ Ⓣⓔⓧⓣ. There's also crazytext.org for 匚尺丹乙ㄚ 匕モメ匕 (various foreign characters that resemble Roman letters).
Aͧ̄͛̓̾͟͏̗̩n̠̫̜̮̆d̻̰̗͕̪̾̔̀ ̍̀̀ͥ̅̿͝͏̯̹̼͈̦̹͞ͅt̑̐̑͋͒ͮ͏͇̱̜̪͙hͣ͐͏͚͖̗͎͉̀e̦͙ͥͩ͒̇̏̉̔n̢͎̖̳͕͎͚̻̆̑͆̃̊̓ͅ ͎̬̔́ͯ͊̅̄͠t͉͙̯̙ͧ̃͜ĥ̶̡̘͎̹͚͚̰̤͐͌̈́͛e̔̆̔̓̽͢ͅr̢̜͕̻͈̮̖̹ͮ̋̔ͤ̉͛͡e̩̺͖͉̭̯̅͗̿'̢̫̰̫̜̮̘̫͍͔ͤ̈͌ͣs̶̴̮̻̭̠̐̾̉͡ ͉͙͈̹͔ͦ͌̆̽̾t̿̃͏̟͈̀h̡̢̰̞̼͎̦̜ͣͬ̏ͬ̂̚ḭ̡̻̥̖͚̘̘̔ͨ̅ș̪̲̺̞͑̄ͮ͝ ̸̧͔̙͙͕̦͉̫ͮ͋̀ͤ̈́̇̚o͖̥̖̣̲̮͔͒ͪ͆͌͞b̫̠́̎ͤ̐ͧ͂ͧ̈̀ņ̵̢̩̺̻̖̰̣͂̋̂̐ͫͣ̓ͭǒ̴̸̤̠̖x̵̝͖̣͇̗̲̚i̲̱͚̭̦̪̞͔̽͗̍͗ỏ̲̖͚͖̱̇u̴̶̬͎͙̮̳̙ͭ̃̅s̷͙̍͠ ̦̓ͭͯͪͮ̇ͯ̊Z̴̰̩̆̚a̦ͮ̊l̼̫̙̟̼̇̂̈͛̀̀ͫg̶̹͉̟̙̹̒ͦȯ̲͉̲͚̈́͞ ̸̠̰̫̜̗̠͓͉̗ͣ͐̌́s̩̭͓̬̒ͪ̚͢h̵̝̩̼̪̝̳͕̔̏̆ͅḭ̸̵̥̗̞̣͔͊̿̓̔̀t̺̞͖̠̹̒̊̈̅ͯ͆ͥ́̀͡.̫̭̲̲̺ͬ̆ͨͭ̒͗̚͜
EDIT: (11 June 2011) bubbletext.org has gone away, but bubbleballtext.com is still there. They also have an upside-down text option, but the original dıןɟ is still working - which one produces better output is a matter of opinion. Crazytext.org is also a dead link, but crazytext.net does something similar (with more options). And zalgo.eeemo.net? Still there.