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All about Euphoniums 
General Info
Famous Soloists
Manufactures
Model comparison
So, here is a list of links. I hope you would appreciate it.
General euphonium sites
Das Deutsche Tuba-Forum (D) Leonard Falcone Int. Tuba & Euph. Festival (USA) LIEKSA International Tuba Competition (Fin) International Tuba Euphonium AssociationEuphonium soloists
Lyndon Baglin (UK) Dr.Brian L. Bowman (USA) David Childs (UK)Nicholas Childs (UK)Robert Childs (UK)Enrique Crespo (Uru - D)Riki McDonnell
+ (NZ)Leonard Falcone + (USA)
Tormod R. Flaten (N)Adam Frey (USA)Morgan Griffiths (UK)Ben Haemhouts (B)Bente Illevold (N)Derick Kane (UK)Simone Mantia + (USA)Rich Matteson + (USA)Steven Mead (UK)
Stef Pillaert (B)Thomas Rüedi (Ch)Daniel Thomas (UK)Kevin Thompson (SA)David Thornton (UK)Glenn Van Looy (B)Robbert Vos (NL)David Werden (USA) Glyn Williams (UK) Alexander Wurz (D) Tuba soloists
Oystein Baadsvik (N) Roger Bobo (USA) James Gourlay (UK)Patrick Sheridan (USA)Manufactures
Adams (NL) Amati-Denak & Cerveny (TCH) Besson (UK)
(Buffet Group)Antoine Courtois (F)
(Buffet Group)Eastman (USA) F.E. Olds (USA) Gebr. Alexander (D) Geneva Instruments (UK) Hirsbrunner (CH) Holton (USA)
(Conn-Selmer Group)Jupiter (USA) Kalison
(G&P Milano) (I) King (USA)
(Conn-Selmer Group)Lechgold (D) Manchester Brass (UK)
(Adams)Meinl Weston (Melton)
(Buffet Group)Miraphone (D) Selmer - Bach
(Conn-Selmer Group)S.E. Shires Co. (USA) Sterling (UK)
Vogtländische Musikinstrumentenfabrik
- B & S (D)
(Buffet Group)Weril (Bra) Willson (CH) Yamaha Wind Instruments (Jap)York (Schreiber - Keilwerth) (D)
- no longer manufactured (2010) (Buffet Group)