I wrote a program several years ago for the Nokia 9210 and am trying to update it for the 9500.
I went to download the Series 80 Developer Platform 2.0 SDK (S80_DP_2_0_SDK.zip). It starts out downloading, saying the total size is 124 MB, but when the download gets to around 16 MB the progress bar goes all the way to 100% and the download quits. If I try to open the file WinZip says it is corrupted and I should try downloading again.
I have tried downloading this file using both IE 7 and Firefox and got exactly the same result, so it appears to be a problem on your end.