Fortis is the biggest bank of the BeNeLux region and the shares have dropped to around 5euros or something (35euro last year). They were a healthy and profitable bank, but their mistake was buying dutch bank ABN-Amro for too much money, in cash and with money they didn't have at the time. Coffers were empty and then the financial crisis started/got worse and now they're struggling. Had they not bought ABN-Amro they would have been fine. Now it's either going to be nationalized (unlikely), or bought by ING or BNP Paribas. Either the financial corporate world will become a duopoly in Belgium, with IGN and KBC or Fortis will be bought by the french BNP, which is also bad.
I have a Fortis account, but luckily I don't nearly have 20.000euros (I wish) in the bank so all of that is insured if they'd over topple over which is still very unlikely they say.