I use softpedia mainly, and cnet's download.com on occasion, to find new software. I prefer these to other download sites, however one big problem with I find will all download sites is they do a bad got of classifying software - they would all benefit from having a lot more software categories. Also, it would really help if the antivirus sections were better organised. I would really like to be able to see an antivirus section containing solely full antivirus software, excluding the manual definition update downloads and removal tools. I use FlashGet to keep my software up to date, but sadly it is very buggy. Only the 1.xx versions have the option to check for updates - it has been removed in 2.xx and 3.xx versions, so I'm stuck with an outdated and version which is prone to crashes at times.
I thought the authors/developers site option would top the poll. I thought so because since we are all security paranoids the best way to get software is from the source itself.
I always prefer vendors' servers and sites. If not possible, I first go to Softpedia. I also trust Filehippo.
I go to download sites to find new software - how else would I be able to keep up new software releases every day. However I download the software I find from the author's site to ensure I get the very latest release, and also, since I use FlashGet as my download manager, I can check for updates to it.
I am using filehippo as this is the only portal I trust and also it is very neat, simple and clean. I like it very much! CNET & Co. I do not trust or like at all (majorgeeks is - or was - beyond ugly in my opinion, I hate this portal ). Of course, if not listed on filehippo, I go to developers site. - And I am constantly assisted in updating (which btw is not a pain for me but fun and quite a hobby ) through filehippo's update checker (every day), KC's Sumo (every few days) and Secunia PSI (now and then, of course v2.x, not "baby"-version v3).
Mostly Softpedia, FileHippo and MajorGeeks. Sometimes AfterDawn which is a lesser known but useful for me due to it's "All Versions" feature - basically an archive of older versions of programs.
I also tend to think the choice of the portal doesn't matter so much - if you check the md5 or sha sums of the executables downloaded from the author's site and, say, sourceforge and they are identical, it's safe.
For downloading I use cnet and softpedia. For learning about free progs - Gismo's TechSupportAlert - awesome portal.
CNET (-Download.com-) and the Software Author's web page. I would prefer the Software's Author's web page. All downloaded files are scanned at VirusTotal.