The best replacement for megashares is rapidshare.

The best alternatives to megashares are rated as following:
★★★★★  rapidshare
★  megaupload

Your alternative for megashares is not listed? Suggest!
Speaking about megashares, one probably shouldn't forget about flashget.

Other search terms related to megashares and their ratings are:
★★★★★ flashget
You have in mind a companion for megashares and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of megashares in all years. Click on graph for more.
megashares
rapidshare
megaupload