You can't download trial version of IBS websphere portal. What you CAN do is download and install RAD 6.0 it comes with IBM Portal Test environment. You can develop and test your portalets on that. RAD 6.0 comes with portal test env. 5.0 then you have todownload test env. 5.1 separately and integrate it with RAD.
IBM recently release portal server 6.0 ..don't know if the 6.0 test env. is available for downlopad. If you find it, kindly post a link here.
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