currently working on a photography-related project, I need a robust solution for bulk image uploads. After dabbling with a commercial solution called MultiPowUpload I ran into serious problems when uploading from a Mac. Eventually I found out, that these problems are not limited to this uploader but seem to occur with most flash-based uploaders together with flash player v.10.
The alternative would be something like the Aurigma software (you probably know it from Facebook and some other big sites) but I'm hesitant, because it requires an ActiveX- or Java install from the user. On the other hand it offers to resize files on the client side, allowing faster uploads and saving quite some bandwidth.
I also hat a look at SWFUpload, which lets you control almost every aspect of the uploader and even has Javascript callbacks on all events. But it looks a bit complicated and before I dive into that, I would like to hear your advice: which way would you go to build a robust bulk upload solution for your website?