Is it Flickr doing the compression? Or when you are getting ready to upload?

I only use Flickr for volunteer work I do for Toastmasters and I upload the full file size and it seems to work. I use cable. Am I doing something wrong?

I've got a Picasa site that I use. I've got Picas's uploader tool installed on my Mac and I can choose various upload sizes and I use the faster upload of 1000 pixels. You can look at my web site and it's a slideshow from Picasa that I pasted the html in my index page. Do the photos look OK?