Talking Points Memo has reproduced Roll Call's handy chart of members of Congress in the 109th Congress who are facing federal investigations.  Some involve famly members.  Some of them are already gone from Congress. 

The list from Roll Call includes: Burns, Cunningham, DeLay, Doolittle, Harman, Foley, Frist, Jefferson, Kolbe, Lewis, Menendez, Mollohan, Ney, Renzi, Specter, Stevens and Weldon. TPM added Katherine Harris.